Official Luthiers Forum! :: View topic - Wipe on poly over shellac?

I'm planning to tint a guitar with some amber shellac, and then do a wipe on poly for a bit more bulk. I'm worried about the solvents in the poly melting the tint coats and making a smeary mess. Any thoughts/advice?
Thanks

How about nitro over wipe on poly?
I am having a hell of a time getting the wipe on poly to stay glossy over some macassar ebony. It seems that every other grain line is satin and the rest are gloss. I am at over 30 coats of the poly so far. I assumed I would need to build some finish, but it has built with no shine to show for it. I just want to hit it with some rattle can Deft nitro and leave it be.
May do it anyway to test.

Tony_in_NYC wrote:

Don't do this, the nitro won't stick to the poly. What you are experimenting is what Pat is suggesting; the oils in the ebony prevent the poly from curing. Scrape off the poly and seal with a couple of coats of shellac, that'll solve your problem.

Author:	meddlingfool [ Tue May 22, 2012 11:06 pm ]
Post subject:	Wipe on poly over shellac?
I'm planning to tint a guitar with some amber shellac, and then do a wipe on poly for a bit more bulk. I'm worried about the solvents in the poly melting the tint coats and making a smeary mess. Any thoughts/advice? Thanks

Author:	Joe Beaver [ Wed May 23, 2012 12:29 am ]
Post subject:	Re: Wipe on poly over shellac?
Never tried it but shellac and poly, unless it is oil based poly and no-wax shellac, may not be a good mix. Better do a test first.

Author:	Dan Pennington [ Wed May 23, 2012 7:03 am ]
Post subject:	Re: Wipe on poly over shellac?
Wipe on poly will go over shellac with no problem. I do it a lot.

Author:	Tony_in_NYC [ Wed May 23, 2012 9:07 am ]
Post subject:	Re: Wipe on poly over shellac?
How about nitro over wipe on poly? I am having a hell of a time getting the wipe on poly to stay glossy over some macassar ebony. It seems that every other grain line is satin and the rest are gloss. I am at over 30 coats of the poly so far. I assumed I would need to build some finish, but it has built with no shine to show for it. I just want to hit it with some rattle can Deft nitro and leave it be. May do it anyway to test.

Author:	Pat Hawley [ Wed May 23, 2012 11:56 am ]
Post subject:	Re: Wipe on poly over shellac?
Tony, does the wipe-on poly feel like its curing? I don't know about macassar ebony, but I do know that wipe-on poly does not cure very well over EI rosewood. Pat

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Author:	Tony_in_NYC [ Wed May 23, 2012 1:10 pm ]
Post subject:	Re: Wipe on poly over shellac?
Pat, It takes much longer to stop feeling sticky, so I guess the answer is yes, but slowly. I have put it on EIR and it was fine, but this macassar is giving me problems. I think I may just sand it off ans spray some nitro on it. I like the feel of the poly on the neck and the mac. ebony is a back strap. The front of the head stock is getting nitro anyway, so I may as well just spin the neck around and shoot the back strap as well. Thanks for the info. Tony

Author:	Alain Moisan [ Wed May 23, 2012 1:50 pm ]
Post subject:	Re: Wipe on poly over shellac?
meddlingfool wrote: I'm planning to tint a guitar with some amber shellac, and then do a wipe on poly for a bit more bulk. I'm worried about the solvents in the poly melting the tint coats and making a smeary mess. Any thoughts/advice? Thanks It'll work fine, as long as you make sure your shellac is dewaxed, otherwise the poly won't stick to the shellac. Tony_in_NYC wrote: How about nitro over wipe on poly? I am having a hell of a time getting the wipe on poly to stay glossy over some macassar ebony. It seems that every other grain line is satin and the rest are gloss. I am at over 30 coats of the poly so far. I assumed I would need to build some finish, but it has built with no shine to show for it. I just want to hit it with some rattle can Deft nitro and leave it be. May do it anyway to test. Don't do this, the nitro won't stick to the poly. What you are experimenting is what Pat is suggesting; the oils in the ebony prevent the poly from curing. Scrape off the poly and seal with a couple of coats of shellac, that'll solve your problem.

Author:	Tony_in_NYC [ Wed May 23, 2012 1:56 pm ]
Post subject:	Re: Wipe on poly over shellac?
Alain Moisan wrote: Tony_in_NYC wrote: How about nitro over wipe on poly? I am having a hell of a time getting the wipe on poly to stay glossy over some macassar ebony. It seems that every other grain line is satin and the rest are gloss. I am at over 30 coats of the poly so far. I assumed I would need to build some finish, but it has built with no shine to show for it. I just want to hit it with some rattle can Deft nitro and leave it be. May do it anyway to test. Don't do this, the nitro won't stick to the poly. What you are experimenting is what Pat is suggesting; the oils in the ebony prevent the poly from curing. Scrape off the poly and seal with a couple of coats of shellac, that'll solve your problem. Thanks Alain! I will do just that. Fortunately the wipe on poly takes a long time to build so it wont take lone to sand or scrape it off.

Author:	Tony_in_NYC [ Thu May 24, 2012 2:09 pm ]
Post subject:	Wipe on poly over shellac?
I shellacked last night and then put on the poly and it has cured! Thanks for the help!

Author:	Alain Moisan [ Thu May 24, 2012 3:45 pm ]
Post subject:	Re: Wipe on poly over shellac?
Glad to know it worked!

Author:	Tony_in_NYC [ Wed May 30, 2012 7:54 am ]
Post subject:	Wipe on poly over shellac?
You and me both!

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