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Subject: Re: Bonehead conversion varnish mistake


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Message Thread:

Bonehead conversion varnish mistake

Andy Member

I got ready to topcoat a 3d cnc cutout that took 20 hours to cut out, and like an idiot, I used lacquer thinner to thin water white conversion varnish instead of xylene. After half a day of drying, the finish was still very tacky. I added another coat of heavily thinned varnish (this time with xylene) to try to reduce the tackiness.

After two days, the piece is still tacky, though to a lesser degree. Is there anything simple I can do to make the finish cure?

7/26/15       #2: Bonehead conversion varnish mistake ...

Call the techs for the manufacturer of that finish product. If you have to strip it there professional stripping products that you can't buy in a big box store.

Companies like Benco sales and other specialist that focus on really powerful strippers. Always follow all safety precautions!

7/27/15       #3: Bonehead conversion varnish mistake ...

hmm... i use lacquer thinner all the time in my sherwin williams conversion varnish. Never had a problem. Sounds like you didnt add proper amount of catalyst

7/27/15       #4: Bonehead conversion varnish mistake ...

I have to agree with Kevin
Usually if it does not dry is because of too little or no catalyst

7/28/15       #5: Bonehead conversion varnish mistake ...
Daniel Shafner  Member

The quick fix doesn't always work, but it did for me on a rack of doors if you didn't mix enough catalyst is to mix up another batch of topcoat and put in more than the recommended amount if catalyst.

The idea is that this new "hot" topcoat will kick your under catalyzed coating. That's the idea. You'll know if it works, everything will feel cured.

And if it doesn't work, strip or wash everything off and begin anew.

7/31/15       #6: Bonehead conversion varnish mistake ...

if you try to kick the under catalyzed coating in with over catalyzed product your customer will be calling you soon after delivery when it starts curing out. Shrinking, cracking, peeling and full of "Acid Bloom"... tuck your tail and chemically strip the piece and start over... we have all done it...

8/2/15       #7: Bonehead conversion varnish mistake ...
Sean Jackson Member

@andy - so what route did you take?

8/9/15       #8: Bonehead conversion varnish mistake ...
Ken Byrd Member

Wow. I just finished posting a new query about CV cure. (I feel like a bonehead for not searching for this thread before posting) Thanks, all sounds good. Wish me luck, going downstairs now to apply the hot coat. Just have to worry about thickness!!!

8/13/15       #9: Bonehead conversion varnish mistake ...
Ken Byrd Member

Well, last week I did the "hot coat" with almost double the catalyst (5.5%) and it did the trick. Cured enough to thoroughly sand the table top (had bugs in it anyway) then apply a proper final coat. Daniel's advice was right on! Thanks for that boost of confidence you gave me before re-coating!

8/13/15       #10: Bonehead conversion varnish mistake ...
Daniel Shafner  Member

Ken, I'm glad this worked for you. It did work for me. It's a maverick approach that will never find any official sanction, but it's a workaround that is at least possible. It has a better track fecord than, let's say, leatril has or tarot cards, lol.

In retrospect I would also add to my suggestion to mix in some "hot solvent" (something to vive your fresh over-catalyzed application some extra solvency, also). My tbinking is that you want to increase or insure a good melt-in of the application so that everything vets catalyzed.

Who doesn't like a good crosslink, said no undercatalyzed coating ever.

8/18/15       #11: Bonehead conversion varnish mistake ...
Andy Member

Thanks everyone for the suggestions.

I ended up coming to the conclusion that my catalyst was too old. I let the cutout sit and cure in my shop for about 5 days to see what would happen. It eventually got dry enough to sand. It was still somewhat tacky, but hard. I got some fresh catalyst and sprayed a light coat on. That did the trick.


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