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high flash Naphtha softens CAB Lacquer5/4
I have to re spray a piece that was finished with CAB lacquer and then waxed.
When I used Naphtha to clean off the wax, it started to soften the CAB lacquer topcoat.
It's my understanding that Naphtha should not have the solvent strength to do this and should remove the wax while leaving the CAB unaffected.
The CAB had been sprayed the day before and dried overnight, so it may have been a bit green still, but I wouldn't think that should be an issue.
Any idea what's going on? Or am I just misinformed about Naphtha?
Why was wax applied so soon after the piece was sprayed. Or did I misunderstand something.
So now you have learned a lesson. If I said it should have worked, then what? It didn't and that's that. You now have knowledge you didn't have before. So, is the lacquer fully cured? What does the technical data sheet say? Probably not, don't you think? Most coatings don't get any testing done on them for at least 2 weeks after finishing. This is the normal time frame to consider full cure. Of course this is a lacquer, which has only the ability to protect the wood from dust. I can't tell what the data sheet says is full cure, you could always call the manufacturer.
Hi Flash Naptha is hotter than regular VM&P Naptha. The wax or how soon you applied the wax ( although a bit too soon ) had nothing to do with it lifting the CAB Lacquer, its just a hotter solvent.
The wax was not a paste wax, more of a liquid polish and was not applied until the CAB had dried overnight.
The application of wax (polish) is standard practice by the shipping and QC people to remove any handling marks, fingerprints etc before packing and shipping.....not my call.
@JeffA, I don't need a scolding, just looking to increase my knowledge of the products when they don't behave they way they are theoretically supposed to.
That's what I suspected might be the case but even then I wouldn't think that an oily, Aliphatic solvent would have the strength to soften the CAB lacquer.
And for the record, it didn't lift the CAB, it just softened it up to the point where it was beginning to show rag marks and probably would have gotten worse with continued exposure.
Good thing you stopped when you did, the softening would escalate to lifting had you continued applying it.
is the CAB lacquer pre catalysed?
No experience with high flash naphtha but having done spot finishing (touch up) for many years it was common to wet sand nitro lacquer with naphtha or mineral spirits. Non issue till using a generic "paint thinner" as used to reduce oil based enamel. Found out quickly that formula had some hotter solvent(s) in it & did "soften the lacquer. After 24 hrs dry/cure could proceed as usual. Hope you can salvage the job without compromising the result.