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Question DetailsAsked on 8/23/2017

Should you put Thompsons WaterSealwaterproofing wood protector on rough cut siding

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1 Answer


My personal opinion - you should not be putting Thompsons Waterseal on anything unless you like washing and reapplying 1-2 times per year for the rest of your time in that house. One of the few finishing products which I personally actively recommend against, rather than just not reocmmending - just not a quality solution in my opinion due to poor penetration (tends to glaze at the surface), poor weathering characteristics, does not inhibit solar damage to the finish or wood, and picks up black staining from organic debris like tree drippings.

Rough surface wood (like rough-sawn or brushed surface cedar or redwood siding) is usually best deep-stained with a penetrating oil stain which is NOT heavy - body - 2 coats on initial application. A good oil-based primer and paint can also work (like old- oil based barn paints) and especially the now-banned white lead paints which used to last decades on them - latex I do not recommend because the natural oils in most of the rough-finish siding products come from woods high in natural oils, so you get bleeding and discolored patches in the latex.

On rough brushed plywood surfaces like T1-11 siding a good penetrating primer with two coats of a good long-life acrylic latex paint like the Pratt & Lambert Weatherbeater line is my prefence - or for longer life but more hassle in painting and limits future paint choices, a good oil-based primer and paint.

Here is a previous similar question with answer which might also help - though note the comment on not using paints applies to horizontal surfaces only, ones where water will sit on the surface and soak in through pinholes and cracks in the finish.

Answered 3 years ago by LCD

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