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Building Tips and technical articles. => Paint and finishing => Topic started by: rich gorrill on April 22, 2016, 02:37:07 PM
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Hi all, finished brush painting new plane, four coats of Sig dope. My question is how many coats of clear should I apply over the color using a Preval spray unit. I know to thin it 50/50. I only painted the fuselage and tail feathers, the wing is ultracote.
T.I.A.
Rich
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Rich,
What clear are you spraying?
Charles
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Sig.
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Sig clear dope.
Some say it's fuel proof and others say they have had issues.
Do you have a photo of your model?
Charles
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at 50/50, 5 or 6 coats.
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Thanks Randy.
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I my self quit trying to spray clear dope. I usually brush on 8 coats.
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Doc, I wasn't very clear on my first post. I brushed on 5 coats of clear followed by 4 coats of color. I now want to spray on final coats of clear to prevent the color from being brush dragged. All Sig.
Rich
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This will depend on brand of dope and if you intend to wet sand and rub it out. I've found Certified non- tautening clear has a lot more filler in it and doesn't take as much- but be careful or it will get heavy faster. I have only an airbrush which I use for color. Then I spray on two coats- has to be thinned about 70-80% to airbrush to lock it down. Then I brush on two 50/50 coats, thinned some with retarder. After three weeks it's hard enough for a good sanding/polishing. If I weren't going to rub it I'd just do one coat. Two or three with other brands. One coat Certified = two or three other brands, especially Sig Lite Coat although it's a great product. You'll just put more coats.
Dave