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| Advice on brushing on water based lacquer http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10122&t=50033 |
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| Author: | Conor_Searl [ Fri Dec 08, 2017 5:41 pm ] |
| Post subject: | Advice on brushing on water based lacquer |
It's getting pretty cold around here, and so I'm hesitant to keep spraying in my garage. The instructions on the product say not to apply under 15 degrees celsius. Plus I don't like standing in the cold. So I've decided to try and finish a couple kits I have by brushing the lacquer on instead. I've heard people have good results thinning the product a little more than usual, I was wondering if there is anything else to take into consideration? I've experimented with some color on the back of a tele, and it seems hard to get good even coverage... |
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| Author: | Freeman [ Fri Dec 08, 2017 6:54 pm ] |
| Post subject: | Re: Advice on brushing on water based lacquer |
There was an article in American Lutherie a while back about brushing waterborn lacquer (specifically KTM-9) but I don't think it said anything about temperature. The author got good luck but as I remember, he had to do a lot of leveling to get the brush strokes out. KTM-9 is one of my two favorite finishes (nitro the other), I will frequently reduce it with denatured alcohol when its cold or I want better flow. Another trick with KTm-9 (and I assume others) is that when I finish I wash out my gun with warm water, then put some alcohol in it and shot it thru the nozzle - water is soluble in DA and it will keep parts from corroding. I leave a little DA in the cup and when I'm ready to spray the next day I shoot a mist of DA, then fill the cup with KTM-9 and start my spraying. The DA seems to make the surface slightly tacky and since I've been doing that I haven't had any witness lines when I sand. Another thing you might try is warm the lacquer in warm water and put a heat lamp on the guitar. |
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| Author: | Conor_Searl [ Fri Dec 08, 2017 7:37 pm ] |
| Post subject: | Re: Advice on brushing on water based lacquer |
Thanks Freeman, I thinned this Brite-tone lacquer quite a bit with reducer, and my test piece levelled itself out quite nicely as it dried. Not much in the way of brush strokes, but I'm having a heck of a time getting the color to cover evenly. But I'm wondering if that has more to do with how much colored pigment I've added, as I have the same problem when I spray, I only get good color coverage when I spray a very heavy wet coat. But the mixed lacquer looks nice and opaque before it goes into the gun or onto the brush... |
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| Author: | Freeman [ Fri Dec 08, 2017 9:59 pm ] |
| Post subject: | Re: Advice on brushing on water based lacquer |
Sorry, can't help with the color thing. I have only done clear and tinted lacquer, I save the solid colors for my motor cycle painting friend. |
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