Primer for over varnish

Kiltz oil based primer then paint to desired shade.

-- Sawdust and shavings are therapeutic

I’ve used Kilz and just plain old dewaxed shellac.
You can also just use a liquid de-glosser, an oil based primer, then spray.
Bill

-- bill@magraphics.us

Shellac will stick to almost anything, and if the finishes have any contamination left on them you might run into problems. Applying a coat of BIN (the first one you named) pretty much guarantees everything else will stick.

-- I long for the days when Coke was a cola, and a joint was a bad place to be (Merle Haggard)

I painted over varnish many years ago. I just bought some Deglosser and mixed in in the paint. Worked great. One coat.

-- In God We Trust

Thanks Fred.
Sanded a unit till gloss was gone, wiped down with mineral spirits, applied BIN Shellac-Base Primer-sealer, lightly sanded again, then 2 coats Benjamin Moore Advanced paint. Fantastic !!! Great adhesion with BIN over varnish.

-- - - - Rod , Lloydminster, Saskatchewan, Canada