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Painting Hightemp Silicone sealer


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Old 02-20-2018, 07:29:42 PM
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Tom Jamboretz Tom Jamboretz is offline
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Default Painting Hightemp Silicone sealer

Just finished making a model Robinson Hot Air engine. In the process some Hi temp silicone is exposed. Is there some treatment I need to do before spraying rattle can Rustoleum? TJ
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Old 02-20-2018, 08:34:24 PM
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Default Re: Painting Hightemp Silicone sealer

Silicone is one of the most difficult things to paint over. I don't think there is any treatment you can do to change that. A body shop I worked in banned all silicone products since a wiff of it in the shop caused instant fish eyes in painting in progress in the paint booths.
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Old 02-21-2018, 12:47:38 PM
Andrew Mackey Andrew Mackey is online now
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Default Re: Painting Hightemp Silicone sealer

Paint will not stick to it. Besides the silicone, it gives off an acid vapor over time, that will remove the paint anyway. read the instructions on the product label for removal, and take as much off as possible. maybe you can use another product that would be paintable, like a refractory cement?
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Old 02-21-2018, 04:11:35 PM
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Default Re: Painting Hightemp Silicone sealer

Personally, looking at your model, I'd just take a razor blade and trim it off flush with the castings, or just a little proud of being flush (to get rid of the bigger blobs) so you can paint it and then carefully finish trimming it flush after painting.

Shouldn't look any worse than any other gasket material that would be visible if it were painted and then assembled.

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