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| Pre-cat lacquer over normal nitro http://luthiersforum.com/forum/viewtopic.php?f=10101&t=49191 |
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| Author: | jshelton [ Wed Mar 29, 2017 5:51 pm ] |
| Post subject: | Pre-cat lacquer over normal nitro |
I know that pre-catalyzed lacquer must be restricted to no more than 3 coats so has anyone tried building with normal nitro and finishing with a coat or two of pre-cat? It seems like a way to get a fast cure to avoid the long wait for normal nitro to get hard enough to polish. I suspect it won't work since the undercoats would still be shrinking but has anyone tried it? |
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| Author: | B. Howard [ Thu Mar 30, 2017 7:29 am ] |
| Post subject: | Re: Pre-cat lacquer over normal nitro |
Not going to work. The harder precat will wrinkle and crack because you cannot put a harder coating over a softer one. The restrictions on precat or post cat systems have little to do with number of coats applied. It is about keeping final working films under 5 mills after buffing.Depending on actual solids content and thickness of wet spray you will find that 7 coats is about the actual maximum. If you want fast cure and harder finish just use a precat for the whole thing. |
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| Author: | jshelton [ Thu Mar 30, 2017 8:24 am ] |
| Post subject: | Re: Pre-cat lacquer over normal nitro |
B. Howard wrote: Not going to work. The harder precat will wrinkle and crack because you cannot put a harder coating over a softer one. The restrictions on precat or post cat systems have little to do with number of coats applied. It is about keeping final working films under 5 mills after buffing.Depending on actual solids content and thickness of wet spray you will find that 7 coats is about the actual maximum. If you want fast cure and harder finish just use a precat for the whole thing. Thanks, this is pretty much what I expected. I tried pre-cat on three guitars and ended up refinishing all three due to crazing, swore I'd never use it again. |
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