Certainly on the couple of car bodywork repair manuals I've got they caution that this sort of filler can be porous - and say to use the metal loaded type if possible. It's quite a bit more expensive, though.
Exterior Wood filler
Feb 17, 2004
41 Replies
Another way is to make a filler from epoxy resin thickened with microballoons and fumed silica, far better than the cheap stuff and not that expensive too.
cheers, Pete.
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