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mixing finishes question

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Forum topic by Jay Nolet posted 642 days ago 506 views 0 times favorited 6 replies Add to Favorites Watch
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Jay Nolet

74 posts in 664 days


642 days ago

Topic tags/keywords: question finish

Hello all! I had a problem with getting a smooth finish from shellac, so after three coats I sanded smoothed and put acouple of coats of oil based poly. Looks like it came out fine. Is there anything I need to know about?

-- I think, therefore I think I am.


6 replies so far

View Fred Hargis's profile

Fred Hargis

1715 posts in 1118 days


#1 posted 642 days ago

It pays to use dewaxed shellac under anything polyurethane. You may not have a problem if it was waxy shellac, but no sense in taking any risks. Polyurethane varnish doesn’t adhere as well as non-poly formulas, and things like the wax in shellac has been known to cause problems. If your shellac was waxy, nothing to do now but watch. But there’s also a chance you won’t see any issues.

-- Our village hasn't lost it's idiot, we sent 'em to Washington.

View Bill White's profile

Bill White

3403 posts in 2586 days


#2 posted 642 days ago

I just hope ya used dewaxed shellac. If not, the poly will not adhere.
Bill

-- bill@magraphics.us

View Jay Nolet's profile

Jay Nolet

74 posts in 664 days


#3 posted 641 days ago

The poly is dry and hard. Might there be pealing at a later date?

-- I think, therefore I think I am.

View Cosmicsniper's profile

Cosmicsniper

2199 posts in 1784 days


#4 posted 641 days ago

Could be. It’s been tested both ways, some having issues with waxed shellac and others not. I have not. But over time, I might.

If you used something like the Zinsser Shellac from the can, that would be a 3# cut, meaning that there are 3 lbs. of shellac per gallon of denatured alcohol…a little thick to brush on. I’d dilute by 1/2 alcohol. That’ll give you a 2# cut which brushes on smooth and level.

Ideally, you’d use dewaxed shellac, like the Zinsser Sealcoat which is a 2# cut out of the can. Or, you can dewax it yourself by skimming the top off a can of shellac that’s been sitting still for a week or so…the wax usually settles at the bottom. The full shellac is more for when you want to use only shellac for the finish.

-- jay, www.allaboutastro.com

View Clint Searl's profile

Clint Searl

1420 posts in 986 days


#5 posted 641 days ago

Don’t worry about it. It’s either OK or not; if it’s not, you’ll find out soon enough.

-- Clint Searl.............We deserve what we tolerate

View Jay Nolet's profile

Jay Nolet

74 posts in 664 days


#6 posted 641 days ago

Thanks for the info. I found that I had an oily wood and it would’nt take poly. Being new to the hobby, I did know that I could use shellac on an oily wood, but I didn’t know about thinning. Now I know that I can thin, dewax or get it drunk on alcohol. I love this site.

-- I think, therefore I think I am.

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