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Building Tips and technical articles. => Paint and finishing => Topic started by: Curare on May 14, 2014, 12:55:34 AM
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Hey guys, just a bit of a quick one. In my previous spray jobs I've learned through experience that a priming job hurried is a priming job wasted. Most of my RC models are glassed with 1/2oz or 3/4oz cloth, and according some bright sparks I read you could fill the weave with primer. Anyway to cut a long story short, I found that you'd be a fool to, as acrylic primers shrink and after a few months I had a nice weave showing through my metallic teal pattern ship.
I've since come up with fixes for this, and one of them is to let the primer sit as long as I dare before I cut it back, so I'm not cutting away all the paint before it's had time to shrink.
Now, in the case of DC 540 and other rattle can primers, what's your wait time between laying that stuff down and cutting it back, a day? a week?
I like a week.
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I thought primers were used to cover all the bad spots on the base coats that were made while filling the wood grain or fabric weave.
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If you're concerned about it, use a catalyzed primer like K-36. It doesn't shrink.
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If you're concerned about it, use a catalyzed primer like K-36. It doesn't shrink.
I was going to suggest that. How heavy is it compared to acrylic or lacquer primers, assuming that you're as diligent about sanding most of it off as you would any other primer?
At Wescott's Auto Restyling we used a catalyzed polyester primer for its compatibility with the rest of our processes. It built way faster than lacquer primer, sanded like a dream, and would seal up and polish well enough that you could take molds off of it without a top coat of any kind. I suspect it'd weigh a ton on anything flying, though.
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Tim,
My experience is K-36 is pretty compatible as far as what you paint over it and it sands very easily. I didn't think it was any heavier than clear dope and zinc sterate or talc.
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When I was using a gun to spray on primer I liked DuPont no. 131 Fil'n'Sand and a PPG product. Now I only use spray can lacquer based filler/primer like Duplicolor or the NAPA DC 540. It all dusts off the next day and I do not notice shrinking later on.
Bill