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Tack Rag Residue on Spar Varnish
Question
Forum Responses
I have 10 panels on this order, all of them operable louver. Is there a safer (for the finish) or easier way to remove the residue without having compatibility issues when I spray the final coat?
From contributor G: At a guess, I'd say the mineral spirits dissolved the tack out of the tack rags and left it on the shutter. You need to find the mildest solvent that will wash it off. Note the word wash. A fast wipe likely won't do it. Try soap and water first, then alcohol, then acetone. From the original questioner: Thanks. The lacquer thinner dries fast, which I like, so it does not dissolve the varnish. But it is leaving too much of the residue, which means applying it repeatedly. I had not thought of soap and water. Do you think that may cause a problem with my second coat? From contributor L: This seems like a good place to remind waterborne users to never use tack rags. What they leave behind will cause adhesion problems for waterborne finishes. From contributor G: Provided the soap (not detergent) idea works, if all the soap residue is rinsed off, you should be good. After the rinse, they can be wiped dry and then sanded for the second clear coat. This should deal with any lingering residue. About tack rags - you can make your own with a bit of thinned varnish on a lint-free cloth. For waterborne tack rags, I've wet a lint-free cloth with isopropanol and water.
From the original questioner: Thanks for the tip about not using tack rags on waterborne finishes. Did not know that. I have found out that wiping the panels with mineral spirits is removing most of the residue. Soap and water did not seem to do much. After the wipe down with the paint thinner we will lightly sand and tack again with a drier tack rag. Respray and expect the best of results. Thank you for the helpful suggestions. Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Have you reviewed the related Knowledge Base areas below? 
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