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can one apply laquer over shellac

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Forum topic by dottyw posted 06-26-2019 09:59 PM 429 views 0 times favorited 20 replies Add to Favorites Watch
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dottyw

19 posts in 26 days


06-26-2019 09:59 PM

I have used Zinsser Bulls Eye shellac clear from an aerosol can on my project, a dining table. I phoned Rust-oleum (after applying it, unfortunately), they said it is not dewaxed. I was planning to use Watco clear lacquer over it as a final finish. Reading the fine print on the Watco can it says not to use it over shellac. Is there another brand of lacquer that could be used at this point ?


20 replies so far

View Bill White's profile

Bill White

5210 posts in 4376 days


#1 posted 06-26-2019 10:12 PM

Lay on a coat of Zinsser SEAL COAT. It is dewaxed. I think that you’ll be good after that. Add the lacquer and go.

-- [email protected]

View hkmiller's profile

hkmiller

139 posts in 497 days


#2 posted 06-26-2019 10:17 PM

As Bill stated you need to seal coat since this dewaxed.

-- always something

View dottyw's profile

dottyw

19 posts in 26 days


#3 posted 06-26-2019 10:51 PM

Thanks for your relies. My concern is that the dewaxed sealer coat may re-activate the Zinsser Bulls Eye shellac and the wax will come to the top. Has anyone tried this order of application already, succeesfully ?
If indeed this can be done, then would I have to sand the the dewaxed sealer coat before applying the laquer, what grit ?
I also just read that alkyd varnish would work over non dewaxed shellac. Has any one of you tried this ?

View Aj2's profile

Aj2

2321 posts in 2214 days


#4 posted 06-26-2019 11:26 PM

Sanding that premade shellac is very difficult it’s too soft. Use denatured alcohol lots of it and wipe it off with lots of rags and good ventilation plus a respirator. Denatured is bad stuff to breathe.
Buy some fresh shellac flakes that are dewaxed. Usually blonde.
I don’t know why you think you need shellac for a seal coal. It is good practice for the future projects that require it.
https://www.shellacshack.com/

Good Luck

-- Aj

View CWWoodworking's profile

CWWoodworking

528 posts in 595 days


#5 posted 06-26-2019 11:32 PM

wipe the shellac off with denatured alcohol and just use the lacquer. No need for shellac.

View pintodeluxe's profile

pintodeluxe

5949 posts in 3229 days


#6 posted 06-26-2019 11:40 PM

I would use lacquer right over the shellac. Sure, you should have used dewaxed… But I don’t think it will matter in the real world.

I have used lacquer over shellac and it works, but I don’t make a habit of it. I prefer to just use lacquer.

FYI keep the project away from direct sunlight, because it will crinkle the lacquer. Once it cures you’ll be fine.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View dottyw's profile

dottyw

19 posts in 26 days


#7 posted 06-26-2019 11:43 PM

sorry wiping off is not an option. Had to stain the table since color and pattern of the leaves did not match the table. Then I put shellac over it. Then another coat of stain, since the first coat of stain was not enough. I really really need help moving forward, with the not de- waxed shellac already there.

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dottyw

19 posts in 26 days


#8 posted 06-26-2019 11:48 PM

pintodeluxe, did you use laquer over non dewaxed shellac? If so, what brand please?

View CWWoodworking's profile

CWWoodworking

528 posts in 595 days


#9 posted 06-26-2019 11:52 PM

So what kind of stain is on the shellac?

View dottyw's profile

dottyw

19 posts in 26 days


#10 posted 06-27-2019 12:06 AM

there are two layers of oil based stain ( a Canadian brand) sandwiched between shellac, the last layer now being shellac. ( not dewaxed)

View pintodeluxe's profile

pintodeluxe

5949 posts in 3229 days


#11 posted 06-27-2019 01:26 AM



pintodeluxe, did you use laquer over non dewaxed shellac? If so, what brand please?

- dottyw

No, mine was dewaxed. Watch the WoodWhisperer video on shellac. I think it will allay your fears and come to the same decision I have… Waxed vs. dewaxed is really not that big a deal.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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dottyw

19 posts in 26 days


#12 posted 06-27-2019 05:53 AM

watched the WoodWhisperer video on shellac. No mention there about waxed vs. non dewaxed shellac in reference to lacquer…. or did I miss something?

View Fred Hargis's profile

Fred Hargis

5579 posts in 2909 days


#13 posted 06-27-2019 11:19 AM

The problem with the shellac is not about being dewaxed, it’s that the solvents in the lacquer (assuming this is solvent lacquer) may have an unwanted effect on it. That’s a definite “maybe”, so if you intend to use lacquer do a test first by treating a scrap piece with the shellac, and then top it with the lacquer. If it happens to be waterborne lacquer, there may be a problem with adhesion to the shellac.

-- Our village hasn't lost it's idiot, he was elected to congress.

View CWWoodworking's profile

CWWoodworking

528 posts in 595 days


#14 posted 06-27-2019 11:33 AM

Having 2 layers of oil based stain in between 2 layers of shellac scares me more than lacquer on top of shellac.

Have you did an adhesion test?

View OSU55's profile

OSU55

2356 posts in 2405 days


#15 posted 06-27-2019 12:03 PM

I think you have 2 options:

1. Use a non-poly varnish over the shellac
2. Strip the whole thing and start again

Shellac or nc lacquer or poor choices for a dining table finish – too soft and not enough chemical resistance. Dewaxed Shellac under varnish is ok, waxed might be ok, no need for either unless used for toner coats. The stain sandwiched in there might be an issue. So, cover it all with non poly varnish (sherwin williams fast dry or p& L 38) and hope all the layers work, or strip it down and use a better finish schedule that uses an appropriate top coat and proper color steps to get a finish that will hold up on a dining table.

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