Latex Over Shellac ?? - Painting - DIY Chatroom Home Improvement Forum

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Old 05-15-2013, 10:14 PM   #1
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Latex over Shellac ??

Is this doable ?

I tried searching this topic and only found shellac over latex.

I've got 35yr old trim in my house that has original finish. The finish appears to be stain and varnish (or polyurethane maybe, can't tell).

I've washed it with TSP and lightly sanded.

I want to paint the trim (and base port) with a latex (water based) tinted paint but I'm certain it won't bond without some kind of "primer" of sorts applied first.

So can I apply a coat of shellac and then roll on my latex top coat or do I have to get a special primer in order for my latex paint to bond ??


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Old 05-15-2013, 11:22 PM   #2
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Latex over Shellac ??

wash ,rinse, lightly sand to degloss and give tooth to surface your priming. I like Zinsser coverstain bonding primer .don't use a china bristle brush .use a Purdy polyester brush.let dry over night ,caul;k in any gaps then 2 coats of quality latex paint that is for trim.others may suggest warter base bonding primer such as stix, Zinsser 123,s/w pro block and I feel that woul;d be a good way to go .im thinking of switching over my self


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Old 05-16-2013, 03:26 AM   #3
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Latex over Shellac ??

That ^ will do it
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Old 05-16-2013, 07:01 AM   #4
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Latex over Shellac ??

Not sure about clear shellac, but pigmented shellac like BIN makes a great primer over stained trim. Latex does good over it.
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Old 05-17-2013, 12:21 PM   #5
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Latex over Shellac ??

Remember shellac is suspended in an alcohol based solvent and you will need alcohol or acetone for clean-up. Plus, as you may know, you really have to race to keep up with it. It starts to dry near instantly.

Zinsser Cover Stain is petroleum solvent based. Great stuff. Solvent based products are getting hard to buy in places though.

Zinsser 123 + stain blocker is waterbased and should work too.

Last edited by user1007; 05-17-2013 at 12:25 PM.
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