Apply wood primer by brush after thinning it to the specified ratio with the recommended thinner. Allow it to dry for 6-8 hours, then apply putty or lambi. Sand the applied putty with sand paper no. 180 and apply second coat of wood primer.
Primer has two purposes: to seal the wood before painting, and to help the paint adhere to the wood. Both of these aspects will help your paint waterproof the wood for longer.
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