When applying TWP Wood stain to an exterior surface, it can be a battle with Mother Nature to find an adequate weather window. With TWP Wood Preservative it should not rain within 12 hours after applying. The stain may not be affected by a little rain especially if it has soaked into the wood already. But in the case of significant rain, it can have an effect on the stain’s appearance.
If it rained on your TWP and you want to know how to fix it here are some tips. After getting rained on still allow the surface to dry for at least 24 hours. Only then will you be able to see the extent of the damage. Because water and oil do not mix, the rain may not affect the appearance as badly as you think.
Once the surface has dried check to see if the finish looks spotted, blotchy or uneven. If it appears the rain did affect the finish, you can lightly wash the deck again as you did prior to staining it. You can use a mild detergent but you are just trying to even out the finish. Don’t wash it too aggressively. If a little TWP comes off that is fine because you are probably going to have to reapply a light coat regardless.
If a light wash is not working to even the finish you may have to do some sanding. You can also use a deck stain stripper if you are unhappy with the results. After cleaning or sanding the affected areas, allow the deck to dry again for a day or two.
Once dry, reapply a light coat of TWP Stain. Only apply as much stain as the wood will absorb. Do not leave excess puddles on the surface; wipe them away with a clean cloth or brush. Try to even out the finish as best you can by back brushing.
These tips should help you fix the problem of rain on TWP stain. In extreme cases, the entire surface may have to be stripped or sanded and completely re-stained. Always check your local forecast before starting a TWP wood-staining project.
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