Surface and timber species preparation

It is essential that all exterior timbers are correctly prepared  prior to coating with ultra V Timberguard. Correct Pre preparation will ensure that your deck or timber feature, once coated with Timberguard, will look & perform to all expectations.

Download: Ultra V Timberguard application instruction

Surface Preparation NEW & OLD Timber

Protect any walls, windows and garden plants by using plastic masking sheets and plastic drop sheets.
All timber surfaces NEW & OLD should be washed with Timber Prep deck wash (oxalic acid) mixed with water to remove natural resin, wax or tannins. Clean the substrate with a low pressure power washer (1000—1200 psi) or a standard garden pressure hose, ensure that the deck wash is completely removed. Take care not to raise the fibres. If this happens a light sanding will be required prior to coating.
Oily resinous timber such as Spotted Gum, Tallow wood and Teak should be left for 8/12 weeks to weather and then thoroughly wash with Timber Prep and apply using a stronger mix of 1:2 parts water. This process may have to be repeated prior to coating if the resin continues to leach out of the timber.
Timber decks previously coated with an Acrylic stain coating should be sanded back to the original substrate using 40 /60 /80 grit sand paper and then finished with 100 grit sand paper and finally washed with Timber prep (oxalic acid) to clean the timber.
For previously coated decks coated with Timberguard ensure there is a sound coating, and wash with a detergent/degreaser. If there is any de lamination of surface present you may have to sand the damaged section to get back to a sound substrate prior to re coating using 100 / 120 grit sand paper.
Previously oiled timber, wait 12 months before coating with Ultra V Timberguard polyurethane. Wash the deck with Timber Prep deck wash (oxalic acid) to remove any dust and oils. This process might have to be repeated several times to remove the oil from the surface.

New Timber (uncoated)

Wash with Timber Prep (oxalic acid) deck wash to remove all contaminates and to neutralize the surface, then completely remove the timber wash with clean water.

Weathered Timber (uncoated)

Dressed timber should be washed with sodium per carbonate mixed with water (Nappisan™) and then cleaning with Timber Prep (oxalic acid) using a stiff brush and garden hose or pressure washer, being careful not to raise the timber fibres called fuzzies.
Rough sawn timber should be washed the same as dressed timber finishing with Timber Prep (oxalic acid) and using a stiff brush or pressure cleaner to remove grey or black timber fibres. Ensure that the acid is completely washed off. Protect all plants and non coating areas with plastic sheets. Do not sand this type of timber finish.

Treated Radiata Pine

Refer to the web site for Surface & Timber Species with regards to the various types of treated pine and how to coat with Timberguard. LOSP treated pine should not be coated with Timberguard.

Minimize Tannin Leaching

By fully enveloping the timber with Timberguard, including the ends, you will drastically reduce the problem of leaching, particularly in timbers such as Merbau, Jarrah, Tallowood and other hardwoods.

Mould, Mildew, Algae & Fungus

These growths generally cause a black, green or grey discolouration on the timber.

If mould, mildew, algae or fungus is present in the timber, treat with household bleach mixed with detergent and water. Start out using 1 part bleach to 3 parts water, or add 25% bleach to your detergent mixture. It is important to protect plants and other surfaces prior to the use of any bleach. Do a test on a spare piece of timber / composite timber first to ensure there is no reaction or discolouration to the timber / composite timber. Apply mixture to a wetted timber and use a stiff brush to remove any mould or mildew. Do not let the timber dry out before removal, to re activate the solution wet with cold water or apply more solution. Ensure complete removal of the solution with cold water and allow 24 / 48 hours for the timber to dry before application of Timberguard.

Removing Fuzzies

Fuzzies can become a problem at anytime, especially with unprotected timber. The sun UV rays kill the outer layer of wood and this is what turns a deck grey. When washing is done this outer layer of dead wood is what is removed. Sometimes this results in the furring of the wood called fuzzies, in particular with wood that has not had any protective coating for long periods. It’s as if the wood has grown a lot of short hairs. It is caused by the tearing of the wood fibres. If left alone they will generally disappear in about 2 to 3 weeks.

This can be easily removed by light sanding with 80 / 100 grit paper or using a good stiff deck brush.

Preparation: Prior to First Coat

Important Note: Choose only from following: 270mm wide 9 – 12 nap Micro-Fibre rollers ( white ) or Mohair roller (white) 100mm wide 10nap Micro -Fibre roller ( white ) or Mohair roller (white). Lambs wool flat applicator for best results ( 180mm, 270mm, 360mm ). 80mm paint brush, 100mm paint brush
Applicator Cradles:- 100mm wide, 270mm wide
Paint trays:- 160mm & 270mm black plastic paint trays, 360mm plastic bucket tray
Paint Handles:- Screw on extended paint poles
Containers:- 5/10 litre plastic container Plastic buckets
Mixers:- Flat broad wooden or plastic hand mixers
Tape:- 48mm wide masking tape, Plastic cover mask with masking tape
Solvent:- Water
Extra:- Rags, Drop sheets, Course sand paper / Medium sand paper, Gloves, Face mask, Wire brush, Tape measure, Measuring jug.
Mechanical Tools:- Air blower. Orbital sander. Pressure cleaner
Airless spray Gun ( 8 to 11 Thou tip ) operating at approx 1200 to 1400 psi. Air assisted spray gun & compressor ( optional spray equipment ) at low pressure
Cleaning Equipment:- Mop & Mop Bucket Squeegee / stiff brush Broom. Cleaner / degreaser ( non alkaline )
Timber Prep Deck wash ( oxalic acid ) water based

Slip Resistant Application for Stepongrit — Roller only
 Mix the Stepongrit (supplied separately) into the Timberguard at a rate of 20grams per litre, ensuring that the product is fully wetted out and completely mixed in with no visible lumps.
 When applying Timberguard with Stepongrit to the surface use a 10/12 nap roller as this will allow enough pickup of the grit and coating product to evenly spread on the surface.
 Always coat in the direction of the grain and do not apply too much pressure to the roller as this will leave an un even amount of the grit on the surface.
 Remember to stir the Timberguard mixed with the Stepongrit at regular intervals to ensure

You are now ready to coat your deck or timber feature:

Roller / Flat lambs wool applicator / Brush

Mask up all vertical wall edging that is not to be coated so that the roller / flat applicator can be run hard up against the wall. Lay down any drop sheets required. Before starting ensure that you have all brushes, applicators, trays, damp rags and drop sheets ready for use.
It is very important that the Timberguard is not applied to a hot timber surface. Make sure that there is not any rain due within 24 hours of the coating and that the timber surface is free of dirt and is dry.
Spray Gun
As with rolling, mask up all vertical wall edging and windows with sufficient plastic cover mask sheeting to protect from any overspray. If coating wall cladding then ensure that the roof line is protected with plastic cover mask sheeting as the spray can blow back in corners etc.
If using an air assisted spray gun ensure that there is no wind to blow the excess product away from the spray area.
If you are using an airless spray gun set the pressure low to about 1200 PSI to ensure that there is not an excess of product applied that can cause product runs. You should always test prior to application by spraying on a piece of cardboard.

Timberguard Primer STEP 2

Before the Timberguard Finish Natural Tone is applied to the exterior timber surface it is very important that the Timberguard Primer (Step 2) is applied the same way as step 3 to penetrate and moisture proof the timber. This will ensure the best possible protection for the Timberguard Finish.

Timberguard Finish STEP 3

Apply the Timberguard Finish (step 3) Natural Tone to the timber surface after the primer has been applied to achieve maximum protection.

Once the amount of product has been poured into the applicator tray, bucket or spray gun pot ensure that the lid is replaced on the container of the Timberguard polyurethane. This is a moisture curing product and will begin to react with the atmosphere.
***Remember that the first coat will absorb into the substrate and therefore will require more product. This will especially apply to coating rough sawn timber.

First Coat Application — Roller / Flat applicator / Brush

 Begin by loading your roller or flat lambs wool applicator (preferred option) with enough product and begin applying the coating on no more than (3) three boards at a time for decking and, (1) one board at a time for cladding. Using light pressure apply along the boards in the direction of the grain and when the applicator is empty, finish by moving in one direction to remove any overlap marks. Do not let the product to pool. Reload the applicator and continue always repeating the coating the same way.
 Ensure that you are able to keep a wet edge thereby reducing any overlap marks. It is important to reload the applicator as quickly as possible to continue the coating of the boards. If you need to stop, make sure that you finish on a timber join or a wall join.
 Use a paint brush to lay off the ends or corners, make sure that there is enough product on the brush to apply an appropriate wet film thickness.
 Make sure that the ENDS of the boards have plenty of product applied. This will assist against moisture protection.

Because the product will tack off quickly do not go back over any damp rolled product as this will force the polyurethane to prick up and therefore not adhere to the substrate correctly. Wait until the polyurethane dries, then sand and or recoat where required.

First Coat Application— Airless spray—Pressure spray
As you are applying the Timberguard with an airless spray gun to your deck immediately back roll or brush to get a better penetration and smooth out any pooling (minimum of 2 people are required for this method). This must be done while the product is still completely wet and not in a tacky state.
When coating vertical substrates do not create too high a build as the polyurethane will form runs and if this happens the coating must be rolled or brushed immediately to remove the excess. It is better to do (2 / 3) two or three thinner coats than to do (1) one thick coat. Re coat after the first coat has dried as per the data sheet instructions.
1 Allow the first coat to completely dry as in accordance with the data sheet specifications, 2 hours at 25°C and slightly longer if the product has been thinned.
2 Dispel any foaming by using a brush directly after the rolling or, wait until the polyurethane has dried and then give the coating a light sand with 100 grit paper, and wipe with a wet rag to remove the dust.
If you need to leave the tray, applicator and brush for a short period of time, cover them with a good rag or towel, this will keep the equipment and product ready for use.
If any product drips from the roller tray, roller, flat applicator or flicks while you are applying, wipe the drips with a damp rag as soon as possible. Do not leave the drips as this will create a different film
thickness and will be seen when dry.

2nd and more Coats

As with the previous coat ensure that all equipment and product is ready for use before beginning.
Apply the 2nd & 3rd coats exactly the same as the 1st coat. Refer to the web site: (, Long Life Tips) for correct number of coats to apply for various geographical regions.
 Begin by coating in the same direction as the first coat and applying the product as per the first coat.
 Ensure that you maintain a wet edge to reduce the overlap marks.
 Take extra care to ensure that the boards are completely covered by the second coat.
 Make sure that the ENDS of the boards are completely covered with the polyurethane.
Clean Up
At the completion of each coat wash all equipment out thoroughly in cold water to prevent solidification of product and allow to dry for re use.
Minor Repairs

Minor repair can be done by first washing and drying the affected area, if it is a scratch a light sanding with 80 grit to 100 grit sand paper or if it is a larger area then use of an orbital sander. Take care not to rub back to much of the previous coat unless the polyurethane has flaked or de-laminated. You will need to re apply 2 / 3 coats of the polyurethane to the affected area.

Maintenance Re Coat
As a rule a substrate will need to be re coated when the original coating is starting to look thin, or is damaged, or if slip resistant grit has been applied is not giving the full slip protection.
Also, if the original coating did not have any slip resistant grit applied and becomes an issue, the slip resis-tant grit can be applied at any time with a minimum of 2 coats as per the application instructions.
If the substrate is to be recoated as a maintenance issue, and the previous coating is in good order, then you will need to wash the decking or cladding with a good detergent/degreaser, using a stiff brush to remove any dirt or stains. Rinse off with clean water and allow the surface to thoroughly dry. A fresh coating of Timberguard polyurethane can then be applied directly over the previous coating.
The re application of the Timberguard should be applied as per the original application methods including applying a non slip grit.
When re coating apply 2 coats as a minimum to ensure a fully protected substrate and to give maximum longevity of product.
Damaged Surface Coating
If the coating has started to delaminate or is badly scratched then it would be advisable to give the surface a light sand prior to coating. Use 100 grit to 120 grit sand paper and when done, wash the surface with a good detergent/degreaser, rinse off with clean water and allow to dry. Ensure all dust created by the
sanding is removed.
Apply 2 / 3 coats of the Timberguard as a minimum re coat to the surface after the completed sanding and washing.


Ultra V Timber Prep is a liquid concentrate that is mixed 4:1 with water. It is an environmentally friendly and a completely biodegradable product that safely brightens and restores the natural beauty of exterior timber, removes tannin and rust stains and is recommended for use on all species of timber, including treated pine.

Timber Prep will not harm timber fibres, grass or most plant life when used properly. USES: As an exterior surface preparation, Timber Prep will Clean and Brighten weathered timber, removes Mill Glaze from new timber surfaces, removes Tannin, Rust, Tree sap, Mildew and Algae stains, Food stains etc from all horizontal and vertical timber surfaces. Timber Prep is used as a neutralizer for all timber species that have had strippers and other cleaning solutions applied. Timber Prep can also be applied to Composite Timber, Concrete, vinyl, rubber and fibreglass surfaces. Timber Prep will not harm existing coatings and finishes.


Step 1: Mix Timber Prep with equal amounts of water (ratio 1:1) for deep stains or (1:4) for normal cleaning in a plastic bucket or plastic pump sprayer. Do not use in a metal container.

Step 2: Thoroughly wet surface and all surrounding vegetation with water before application. Apply Timber Prep solution to wet timber surface with pump sprayer, brush or mop. Ensure liberal, uniform application on all project surfaces. When applying to vertical surfaces apply the product from the bottom to the top. Always maintain a wet working surface by applying more product or use a fine water spray.

Step3: Agitate the solution using a stiff long handled broom to remove dirt and stains and wait for 10 – 20 minutes before removing.

Step 4: Rinse with water using a garden hose or pressure cleaner. The use of a pressure cleaner will reduce the need for agitation; recommended PSI between 500 – 1200. Thoroughly rinse all surfaces after application of Timber Prep. Coverage: Approx 10 – 15 m² per Litre mixed depending on porosity of the timber and application method, when mixed at the recommended dilution rate of (1:4)

Packaging Size: 1 litre container concentrate 4 Litre container concentrate


Caution safety instructions: Contains Oxalic acid. Do not mix Timber Prep with chlorine bleach or other chemicals. Store in original container only. The use of rubber gloves, goggles and appropriate footwear is recommended when handling this product. First Aid: In case of eye contact, flush immediately with water for 15 minutes and seek medical attention. In case of skin contact, rinse with water. If swallowed, give plenty of milk or water, do not induce vomiting and seek medical attention. Timber Prep contains oxalic acid solution 10%, is 100% soluble in water, is non-toxic and non-carcinogenic. Avoid contact with bare metal surfaces: aluminium, zinc and magnesium.