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Author Topic: Primer for resin parts.  (Read 393 times)
Carlo
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« on: April 15, 2019, 01:42:12 PM »

I have cast up some parts in Smooth-On 305 Polyurethane Resin., which is white. I'd now like to prime them a neutral gray to look for defects, and get ready for color. I have always used "DupliColor" brand sandable auto-primer with few problems. Now I'm having trouble with paint flaking off at the least provocation. Any ideas or suggestions? Yes, I wash the castings before painting.

Carlo
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Design-HSB
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Klosterstollen


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« Reply #1 on: April 15, 2019, 01:49:08 PM »

Hi Carlo,

Resein Parts should be beamed sand beforehand, only that removes the Separating Agents completely.
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Regards Helmut
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Burl
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« Reply #2 on: April 18, 2019, 06:59:54 AM »

I ran into a similar problem a few years ago, but with a different brand of paint.  The manufacturer had modified the formula, and it was no longer recommended as "plastic compatible".
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