The short answer is… yes. Coating over an uneven/patchy coating will compromise the adhesion of the new coating and will affect the look of the final finish, so to put a fresh coat down, a patchy surface will need to be brought back to bare timber. Tip: It’s a lot easier to maintain coatings before they deteriorate too far so once you’ve recoated, check it every 12 months to see if it is starting to wear.
Scrub the timber with Intergrain® UltraPrep™ Tannin & Oil Remover
The high strength formula of UltraPrep Tannin & Oil Remover helps to lift the old coating.
Check your timber with a simple water bead test
After removing an existing coating spray some water on the surface and check whether the water beads or soaks in to the timber.
If water is still beading on the surface, the timber will not accept a new coating, repeat applications of UltraPrep Tannin & Oil Remover or sanding maybe required.
If the water soaks in, the coating has been effectively removed and you can proceed to the next step.
Scrub the timber with Intergrain UltraPrep Timber Cleaner
Intergrain UltraPrep Timber Cleaner neutralises the UltraPrep Tannin & Oil Remover and restores the colour of the timber, readying the surface for coating.
When using the UltraPrep Timber Cleaner, wear waterproof gloves and safety glasses.
Avoid contact with painted, concrete or metal surfaces and vegetation.