Grey/Brown wood filler

[Martin Bonner]

When we fitted an oak T&G floor, the knots had been filled with a grey filler which turned brown when oiled. I have now seen some hardwood veneered plywood with the same filler.

It looks as though it might be some sort of epoxy-resin based filler, but I wouldn't have expect that to absorb any oil.

Does anyone know what it is, and where to buy it?

[The Natural Philosopher]

any builder merchants. Its simply plastic wood with a dye in it.

not epoxy at all. In fact its water soluble.

[Martin Bonner]

Thanks!