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Is Zinsser B.I.N the best on top off interior varnish

Hi ive heard some reports that undercoat is better on prepared interior stained varnish than zinsser bin?

is there anything better or the same?

dont really want to strip off the varnish if poss?

cheers guys

I haven’t found anything more robust and reliable than ZinBIN.
two things though for varnish - a thorough scrub down with a green scourer and meths before applying BiN

and although the tin says 45 min recoat time for varnish (or wax) i let it really cure/harden off overnight before under/topcoating

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Pretty sure BE123 plus is designed for going over varnish - not BE123 though.

Hi look at owatrol easy surface prep.