On Sat, 10 Sep 2005 09:17:29 +0100, Stuart Noble
wrote:

it is a matter of some puzzlement to me as to why these stains can
penetrate an oil-based medium.

I don't think they can, but they do penetrate water based "stain
blockers".

I didn't think they could either, now I know different. The Aquaseal
product was based on some organic solvent, MEK IIRC. I tend to forget the
exact details of DIY jobs after a couple of decades.

John Schmitt

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