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CV / 2K poly over lacquer wrinkling

12/17/16       
Jim

Need advice, yearlong job. Our company is being asked to apply a harder finish over lacquer on used furniture.

CV is wrinkling, never have used 2K poly. Not having a problem with fisheye.

Finish schedule:
1 clean with naptha
2 sand
3 seal with vinal sealer, dry
4 scuff sand
5 mist on 3 light coats CV (dry build)
6 scuff sand
7 heavy coat of CV........wrinkle....

Have not tried 2K, we can't strip to raw wood. We well know these are not ideal situations. Anyone have a successful path?

Thanks Jim

12/17/16       #2: CV / 2K poly over lacquer wrinkling ...
RobertJ

Could you explain step No. 5, 'mist of 3 light coats'.....can't say I have every done this technique?

Also, step No. 7 is troubling as well....heavy coat means what in mil thickness?

12/17/16       #3: CV / 2K poly over lacquer wrinkling ...
Robert Member

Jim, putting a harder coating over a softer one is asking for more trouble. I'm not so sure I understand your question or your solution. If the initial coating of Lacquer is chipping/wrinkling, applying a Vinyl Sealer over it wont guarantee that what you put on top of the Vinyl,will stay put.

Hmmmmm, I got a chuckle from your comment that " we cant strip to raw wood "
is what you really might have to do but don't want to do.

I'm reminded of a comment that a Government Contractor once mentioned. It was... " why is there never enough time to do the job right, but plenty of time to do it over ".

12/17/16       #4: CV / 2K poly over lacquer wrinkling ...
Bob Niemeyer

Website: http://niemeyerrestoration.com

Ah I love it when a customer wants this. I think what you want is a more durable finish rather than a harder finish. Glad you have no fisheye issues, thats a plus.
Do a dual clean, your naptha and then a waterbased cleaner also, 409 works well on a damp rag and then rewipe with a clear water rag. Let dry. Then do your scuff sand.
Use a top of the line 2k PU. ICA wood coatings has them and so do a few others. Be sure it uses a Iso catalyst not a cross linker. This type of catalyst system will give you better adhesion and durability over the long haul.
If two coats are required do them still in the "wet on wet" window of the coating used. This will help with your intercoat adhesion.
I have done this system with ICA's AO800 series waterbornes with very good long term results.

12/18/16       #5: CV / 2K poly over lacquer wrinkling ...
Jim

Bob
Thank you that is exactly a successful path that I need!!

I will check it out.

Robert J
The idea behind the mist coats (can't say that it is working....) is to lay coats that dry/flash, fast to try to obtain a "thicker" barrier to stop wet CV solvents from penatrating the vinal to the lacquer...very easley could be wrong headed thinking.....so far not the answer.....

And yes millage can be a problem. We sand the origional coat hard to cut it

12/19/16       #6: CV / 2K poly over lacquer wrinkling ...
Shane

you are wrinkling your "Dusted" coats of C.V. Back in the day you could get away with dusting to build up nitro lacquer..... it only works there.... you absolutely cannot do this technique with a mechanical bond type coating that does not 're-wet" itself...
You'll have more luck if you insist on coating over the top of this existing finish by cleaning well... vinyl sealer and laying out a wet coat of C.v.... done

12/19/16       #7: CV / 2K poly over lacquer wrinkling ...
Jim

Thanks shane


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