Do I Need To Bleach Exterior Wood Surfaces Before Painting?


Sanding produces dust, which may make it difficult for new paint to stick. As such, you should wipe the old wood surface with a mixture of 1 cup bleach, 1 cup trisodium phosphate (TSP) and 2 gallons water. … Cleaning kills any mold and mildew in the old wood. Avoid using a power washer to minimize damage to the wood.


So, if you haven’t painted exterior within last six months, it is recommended you need to wash exterior walls, soffits, fascia, porch ceilings, removing dust and debris, before painting again. Cleaning, washing off cracks, crevices, where siding overlaps each other tends to collect a considerable amount of dust, debris.

Bleaching a Wood Deck – Tips, Tricks, How To

Frequently Asked Questions

What is the best way to clean wood before painting?

Clean the surface of the wood To ensure that your primer and paint bond well with the wooden material, clean the wood thoroughly with a TSP and water mixture. Be sure to allow adequate time for the wood to air dry to prevent paint blistering or even mold growth between paint coats.

What's the best way to bleach wood?

Wipe it down with water or mineral spirits on a clean, soft rag, then go over every surface with a dry cloth. Wait a day or two for it to dry thoroughly before bleaching. DON’T expect all wood to react the same. The best woods for bleaching include oak, beach, ash, and gum.

Is it safe to use bleach on wood floors?

One of the most significant reasons we advise against using bleach on wood is the chance it could discolor or show signs of fading on your hardwood or other surfaces. In most situations, you only want to use bleach on other surface types or different floor types.

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