Dick R
Shingles are not meant to be painted; they must be stained or oiled. If we are both talking about the same thing then shingles can get moisture in behind them because they have spaces between them which allow for water to be wind driven in behind and therefore should never be painted. Stain is a self priming sealer while paint is a surface protectant that is meant to be put over a primed surface. Another alternative is penetrating oil such as Australian timber oil which works well and looks great but should be done yearly until the wood is sufficiently saturated.
Shingles do require more maintenance then clapboards but both have their own unique look and appeal.
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