Wood Preserver / Primer


Wood Preserver is a ready to use water-based primer/preservative, formulated to protect bare wood against woodworm, moulds, wood destroying and wood discolouring blue stain fungi.

How much will I need? Try our coverage calculator


  • Wood Preserver is a ready to use water-based primer/preservative, formulated to protect bare wood against woodworm, moulds, wood destroying and wood discolouring blue stain fungi.
  • Easily penetrates into the inner layers of the wood, acting as a moisture regulating primer, prior to over coating with an appropriate top coat.
  • This high quality product helps to prevent rot and decay of the treated timber, prolonging the lifespan of the wood.
  • Wood preservative and surface biocide for amateur use against fungal and algal growth on masonry, brickwork, wood and metal.
  • Preserves for up to 5 years.
Directions for Use

Surface Preparation

Shake / mix well before use and frequently during application.
Ensure surrounding areas, including plants and lawn, are protected before application.

New Bare Timber: Ensure the surface is clean, dry and free from contamination.

Previously Coated Timber: All coatings should be completely removed. If necessary grey or deteriorated wood should be sanded down to a clean, sound surface. Wear a dust mask during sanding. If it is not totally removed only some of the Timbashield Wood Preserver may be absorbed, leading to issues such as patchiness which in turn can lead to localised areas of decay, preventing the product from working as intended.

Old Timber: Wood that has decayed or is damaged should be removed and replaced. Brush with a stiff brush to remove any dirt that has become ingrained. Mould, algae and fungi must be removed and treated with a suitable wood cleaner. Fill in any gaps with a suitable wood filler to make a sound surface before treatment.

Please note that the due to the differences in porosity of some wooden surfaces, rough sawn, absorbent wood may require a higher volume of product. This is due to how much product is absorbed. A test patch is always recommended.


Apply the product onto dry wood when there is no imminent rain forecast and the temperature is betwen 10 and 30 degress. Wood should be frost-free when treated. Failure to meet these requirements may adversley affect the drying and durability of the finish.

Brush/Roller: Apply by synthetic brush or roller that is designed for water-borne products, spreading out thinly and evenly along wood texture. Allow the product to penetrate the wood and leave to dry before applying the next coat. Under normal conditions this should take 4-6 hours. Apply subsequent coats and then wait at least 24 hours until overcoating with your chosen top coat.


DIP: Undertake a contolled dip of the timber to be treated into the Timbashield Wood Preserver. Allow to fully dry before overcoating and avoid immediate stacking of stained items until dry.

Low temperatures, increased humidity and matrix characteristic may increase drying time.


During application, remove any excess with a clean cloth. Any spillages should be cleaned immediately. Clean tools immediately after use with warm soap water, subsequently rinse with clear water or use commercial brush cleaner.

HSE Approval Number: 10872. Timbashield Wood Preserver is regulated under the European Biocides Regulation (EU BPR; EU 528/2012).Please see the Health and Safety sheet for further information.

Storage and Shelf Life

Store product in tightly closed original containers at temperatures above 0°c and below 30°c. Protect from frost and temperatures above 30°c as well as from direct sunlight. Shelf life of the unopened container is 12 months from date of manufacture. Trial before use.

Delivery & Shipping

Mainland UK



£6.95 or FREE on orders over £25




For delivery information visit our Delivery and Returns Page

Product Details & Features

Extra protection without sacrificing the decorative finish of choice, this versatile product primes and protects most types of exterior wood.

Can be used to preserve most exterior wood- ideal for use on sheds, fencing and other garden buildings.

A water thin product that soaks deeply into the wood fibre, protecting from within.

Quick drying and ready for a finishing treatment after only 24 hours under normal conditions.

Note: The finished surface is influenced by several factors including wood species, previous treatments that may have been used, and the condition of the wood, therefore a trial application is always required.

Product Coverage Calculator

Unsure how much product you’ll need to complete your project? Use our handy coverage calculator and we’ll give you an estimated coverage amount.

Additional Information

Safety Data Sheet

Type: PDF
Name: Timbashield - Wood Preserver - Clear
Date: 09-11-2022
File: Download Sheet

Technical Specification

Product Type: Wood Preserving Primer

Base: Water-Based

Usage: Most exterior wood types - rough and smooth 

Application: Brush, roller or dip treatment

Dry time: Completely dry in 24 hours

Coat time: Recoatable in 4-6 hours under normal conditions

Number of coats: 2-3

Colour: Clear

VOC level: Low

Health & Safety Information

Contains 1,2-benzisothiazol-3(2H)-one, reaction mass of: 5-chloro-2-methyl-4-isothiazolin-3-one [EC no. 247-500-7] and 2-methyl-2H-isothiazol-3-one [EC no. 220-239-6] (3:1), 3-iodo-2-propynyl butylcarbamate. May produce an allergic reaction. Keep out of the reach of children. Avoid release to the environment. Read label before use. Collect spillage. Dispose of contents and container in accordance with all local, regional, national, and international regulations. Read all precautions before use. HSE No. 10872. Users must comply in full with all their legal responsibilities under the Control of Pesticides Regulations 1986 (as amended) and the Control of Pesticides Regulations (Northern Ireland) 1987 (as amended), including complying with all Conditions of Approval. To avoid risks to man and the environment, comply with the instructions for use. Use only as described on the label. ACTIVE INGREDIENT: 3-IODO-2-PROPYNYL-N-BUTYL CARBAMATE 0.54% W/W TEBUCONAZOLE 0.15% W/W PERMETHRIN 0.07% W/W


Can I use this product on its own?

No. Timbashield Wood Preserver is designed to be used as a primer to add extra protection against fungal growth and wood boring insects (woodworm) - it does not offer water or UV protection. It is suitable for use with all Timbashield paints and stains (water and solvent based) and most commercial top coats (we always recommend a test patch first for compatibility).

Can I use Timbashield Wood Preserver on top of an already painted shed?

No, this is to be used as a base coat rather than a top coat. 

Is this product waterproof?

Any waterproof protection will come from the chosen top coat - not the Timbashield Wood Preserver.