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Old 04-18-2011, 02:21 PM
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Newb with an HVLP gun... blotch problems

So after beaucoup research and preparation I sprayed on my first layer of primer (motorcycle tank) yesterday. New gun, new equipment, new paint, and not enough experience resulted in orange peel and blotches. (I guess if I were texturing drywall, she'd be marvelous )

I was spraying High Build 2K primer. The directions on the spec sheet said like 10psi was recommended. The more I read here, I'm thinking I will likely need to crank up the psi and do a bunch of testing with this gun - messing with pattern, volume, and psi, and get it right before hitting the real deal.

Question (1) is - I sprayed on 3 coats (I was committed, had to finish). So I assume I can sand this back down with 220 until it's smooth again, redo the high build primer, and then proceed as normal after that (let dry, sand, coat with primer sealer, base and clear). Will this be adequate, or do I need to take it down to metal again (oh and FWIW, I can see some filler work I'll need to spend more time on too)

The high build primer I have states when properly reduced it can also be used as a primer sealer - so question (2) when I'm ready to shoot the primer sealer can I let if flash and then proceed to the base, and then the clear? (that is what 'wet-on-wet' implies correct?) Or do I need to let the sealer coat dry, sand with 400 and then do base and clear. I'm not getting a clear answer from the paint spec sheets.

Thanks in advance?!
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Old 04-18-2011, 04:49 PM
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heres the problem with HVLPs. Newbies see the 10psi and think that is what you set the regulator at the gun at. That is CAP pressure, which shouldn't even be mentioned! Unless you have an expensive guage(only available for some guns) you will never actually know whether it is 10 psi. Set the regulator for the pressure that is recommended. It is either on the gun or on the instructions/packaging with the gun. It will be somewhere around 30 psi at the gun. Some cheap Harbor Freight guns will say 45-50 psi.
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Old 04-18-2011, 04:51 PM
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And yes,once you are ready to paint, mix up the primer as sealer and spray one coat. Let it flash for 30 minutes or so and then base.
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Old 04-18-2011, 10:10 PM
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Quote:
Originally Posted by Underground
heres the problem with HVLPs. Newbies see the 10psi and think that is what you set the regulator at the gun at. That is CAP pressure, which shouldn't even be mentioned! Unless you have an expensive guage(only available for some guns) you will never actually know whether it is 10 psi. Set the regulator for the pressure that is recommended. It is either on the gun or on the instructions/packaging with the gun. It will be somewhere around 30 psi at the gun. Some cheap Harbor Freight guns will say 45-50 psi.
OK - thanks. I was at like 10-20psi at the gauge on the gun, so I'm sure that's the problem. I'll crank it up, and do some testing...
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