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 Post subject: oil over shellac
PostPosted: Wed Oct 18, 2017 3:06 pm 
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Cocobolo
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Joined: Tue Jul 22, 2008 9:34 pm
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Location: ottawa, ontario, ca
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Can any of the oil finishes be used over dewaxed shellac.

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 Post subject: Re: oil over shellac
PostPosted: Wed Oct 18, 2017 3:58 pm 
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Joined: Wed Oct 08, 2008 11:36 am
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Location: Southeast US
City: Lenoir City
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Focus: Repair
I have put TruOil over shellac. Worked just fine and still in good shape about 15 years later.

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 Post subject: Re: oil over shellac
PostPosted: Wed Oct 18, 2017 6:17 pm 
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SteveSmith wrote:
I have put TruOil over shellac. Worked just fine and still in good shape about 15 years later.


Me too, no problem yet.

B

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 Post subject: Re: oil over shellac
PostPosted: Wed Oct 18, 2017 11:28 pm 
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First name: George
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I've used several different oil varnishes over a seal coat of dewaxed shellac without any problems whatsoever. In fact, the only issue I've had with any varnish was over rosewood that had not first been been sealed with shellac. It simply wouldn't dry until I scraped it off, sealed with shellac, and reapplied.

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These users thanked the author George L for the post: pat macaluso (Thu Oct 19, 2017 11:20 am)
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 Post subject: Re: oil over shellac
PostPosted: Thu Oct 19, 2017 8:05 am 
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Brazilian Rosewood
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Yup I think shellac is the universal sealer. I would guess that dewaxed, as you mentioned, is key though. I've been using an oil varnish for the past 3 years and always seal with shellac, so far so good.


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 Post subject: Re: oil over shellac
PostPosted: Thu Oct 19, 2017 8:10 am 
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Cocobolo
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Location: ottawa, ontario, ca
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thanks to all I'm doing it.

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 Post subject: Re: oil over shellac
PostPosted: Thu Oct 19, 2017 7:09 pm 
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Koa
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Depends on what kind of oil finish. Varnishes are probably OK so long as you dewax the shellac and make sure to lightly scuff it... Don't want the varnish to peel back off.

With plain oil finishes - I would not apply over shellac as they will just leave a sticky mess...


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 Post subject: Re: oil over shellac
PostPosted: Thu Oct 19, 2017 7:34 pm 
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Brazilian Rosewood
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The term 'varnish' is so loosely used it can lead to all kinds of problems. I'm not sure even calling it an 'oil' varnish helps. The best answer to all these kinds of questions is... make test panels. Of course sometimes these things don't appear as problems for some time.


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 Post subject: Re: oil over shellac
PostPosted: Thu Oct 19, 2017 7:50 pm 
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Mahogany
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Shellac is used as a sealer to reduce/control the amount of oil that is adsorbed. A wash coat of 1/2 lb cut will have a little effect. Remember Minwax stains are dilute linseed oil and pigment and a little dye.

At some point the oil will not soak in and must be wiped off


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 Post subject: Re: oil over shellac
PostPosted: Fri Oct 20, 2017 2:29 pm 
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Brazilian Rosewood
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I use a siamese red shellac that has some wax in it . Then finish with tru oil or cabinetmakers varnish or laquer. I am using med grade ca glue for finishing open pored woods before final finishing and after sealing with shellac, and experimenting with 2 part epoxy pore filler which I find dificult to master


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 Post subject: Re: oil over shellac
PostPosted: Fri Oct 20, 2017 2:32 pm 
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First name: George
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FWIW, these are the specific "varnishes" I have used successfully over a seal coat of dewaxed shellac, all of which are holding up just fine after 10+ years:

Pratt & Lambert #38
Ace Hardware Great Finishes (solvent-based)
Tru-Oil

Yeah, when trying any material, process, or tool for the first time, testing on scrap is always a good idea.

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 Post subject: Re: oil over shellac
PostPosted: Sun Oct 22, 2017 8:30 am 
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First name: Ed
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City: Chestertown
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Country: United States
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Status: Amateur
"Shellac sticks to everything, and everything sticks to shellac"

I was taught this in the 70's by an old furniture repair guy. I have 40 year old furniture projects around the house with a couple of coats of padded de-waxed shellac, covered in everything from spar varnish (polishes beautifully), to alkyd varnish, to water based varnish, urethanes too, and have never had a failure.

Ed



These users thanked the author Ruby50 for the post: pat macaluso (Sun Oct 22, 2017 11:07 am)
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