Protek manufacture a proper Wood Preservative that is available to buy for DIY use. It has passed all the stringent EU testing and is fully approved to preserve your timber. Some timber is already pre-treated when you buy it so there is no need to use a brush on preservative but some is sold un-treated.
Protek Wood Preserver is a clear brush on pre-treatment that protects timber against wood destroying rot and discolouring fungi. It is moisture regulating and provides an adhesive surface making it a great primer preparation that can be easily over painted or stained with Protek Wood Stain and Protector, Royal Exterior and Restol Wood Oil.
Protek Wood Preserver penetrates wood easily and thereby gets deep into the wood’s inner layers and has the huge advantage of being low VOC. Protek Wood Preserver is suitable for use on outside timbers that are not in direct ground contact.