Seal wood with shellac before applying paint primer - Woodworking Talk - Woodworkers Forum
 
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post #1 of 8 Old 07-25-2018, 03:26 PM Thread Starter
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Seal wood with shellac before applying paint primer

As title says, can this be done? my piece got some minor imperfections which i thought Id even out with shellac and sandpaper. I got the Liberon easy french polish which got about 20 sec open time before it evaporates. In this time i could sand over the wood quickly to fill any scratches, and later go over it with pumice.

I dont know if the Liberon got wax in it, but if it has I can just put it through a coffee filter to get rid of it?

Alternatively i could use boiled linseed oil, by applying a coat then anonther and wet sand it ...

Any idea? will a spray paint primer stick to any of these two? I thought it was safer to go with shellac as it hardens in a day unlike oil finishes.

The primer im using is a matt white acrylic.
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post #2 of 8 Old 07-25-2018, 10:31 PM
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Your message is confusing to me. You start by describing a clear finish and end by describing a painted finish. If you plan to paint the piece, there is no need for French Polish or Shellac.
Shellac is used as a sealer in many cases, but paint is a sealer unless you have something you are concerned with color bleed-through. Color (especially darker colors) can lift and bleed through a light colored paint over time. This could be from old stains, inks, magic markers etc. A primer coat of Kilz will seal prior to your final paint color and prevent bleed-through.

If you don't have time to do it right the first time, when will you have time to do it over?
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post #3 of 8 Old 07-25-2018, 10:38 PM
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Or BIN primer. It's shellac based.

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post #4 of 8 Old 07-25-2018, 11:08 PM
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Shellac is alright under an oil based primer but not latex. Shellac itself has a natural wax in it that latex won't adhere to. You could use a de-waxed shellac such as zinsser sealcoat and put latex over the top. The simplest thing you could do is use a shellac based primer such as BIN like t.carpenter suggested. Two birds with one stone.
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post #5 of 8 Old 07-26-2018, 06:07 AM Thread Starter
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Quote:
Originally Posted by Toolman50 View Post
Your message is confusing to me. You start by describing a clear finish and end by describing a painted finish. If you plan to paint the piece, there is no need for French Polish or Shellac.
Shellac is used as a sealer in many cases, but paint is a sealer unless you have something you are concerned with color bleed-through. Color (especially darker colors) can lift and bleed through a light colored paint over time. This could be from old stains, inks, magic markers etc. A primer coat of Kilz will seal prior to your final paint color and prevent bleed-through.


I am applying the coat of shellac under the primer as a precaution to remove any blemishes before putting out the primer. French polish is just the name of the brand of shellac.

Last edited by Tom Lilletveit; 07-26-2018 at 06:10 AM.
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post #6 of 8 Old 07-27-2018, 11:53 AM
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I use Sealcoat dewaxed shellac before applying a water based finish on wood. The shellac sticks well to most substrates and most finishes adhere well to dewaxed shellac.

Sealcoat is ready to apply (no dilution required). I get it at Lowes.

BIN primer has a shellac base and it is good for use under paints.

Shellac is excellent for sealing knots. It is also excellent for sealing odors. It is not recommended for outdoor use. It dries in 20 minutes and requires good ventilation while applying it.
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post #7 of 8 Old 07-27-2018, 02:35 PM
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I am having a problem with some paints I am trying on turned Sycamore items. friction polish and wipe on varnish seem to go great. But I tried painting with Rustoleum water based house pain and the finish was all blotchy and uneven. But when I paint the wood with red ink and then wipe on poly it looks great. I have also tried the hobby/craft paints (cheap little tubes) from Walmart ad they cover better and smoother than the Rustoleum. So far I have been using a brush. Or cloth to apply the finish. I just acquired an air brush and might experiment with that. I have about 150 small items to paint.
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post #8 of 8 Old 08-05-2018, 03:24 PM
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If I am painting wood and there are knots or other blemishes I prime with Zinzer or other similar shellac based primer. It works great to stop bleed through over time. It comes in an oil or water base form.

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