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  #11  
Old 06-21-2021, 09:33 PM
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tdracer tdracer is offline
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Quote:
Originally Posted by ghrocketman
If you shoot the primer on in THIN layers it will not craze the plastic, it will just BITE into it properly.
Thick coats will melt/craze plastic, just like dope will.

When you start talking about thin vacuform wraps, it's pretty hard to shoot the primer that thin. I tried Rustoleum on a scrap piece from the Apogee Saturn V wraps and if the coat was thick enough to be visible, the thin plastic started to distort...
That's when I stopped using it...
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  #12  
Old 06-22-2021, 10:28 AM
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LeeR LeeR is offline
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Use Tamiya Surface Primer on plastics. It is meant to prep plastic model parts for Tamiya lacquers. It has no fillers, since plastic models have fine surface detail. If you need to fill, then use a conventional primer/filler over the Tamiya.
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  #13  
Old 06-22-2021, 10:47 AM
TigerHawk TigerHawk is offline
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Quote:
Originally Posted by tdracer
I've had issues with Rusoleum primer melting plastic nose cones. I liked the primer - it sands well and gives a good finish, but I stopped using it due to it being unfriendly to plastics.

I've had good luck using Krylon Industrial primer. It's not cheap, I need to buy it by the case, and the shipping costs are horrid. But I like the way it works.

I get mine here:
https://www.globalindustrial.com/p/...sandable-primer


Try https://www.rshughes.com for that krylon primer, shipping is free at $99.00, under $99.00 itís $9.95 I believe.
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  #14  
Old 06-23-2021, 12:08 PM
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afadeev afadeev is offline
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Quote:
Originally Posted by LeeR
Use Tamiya Surface Primer on plastics. It is meant to prep plastic model parts for Tamiya lacquers. It has no fillers, since plastic models have fine surface detail. If you need to fill, then use a conventional primer/filler over the Tamiya.


+1.
Tamiya Primer is great, dries quickly, but is pretty expensive.
And comes in tiny 180ml bottles. It also goes on fairly light, which is great for promoting adhesion, but not ideal if you are trying to fill in and smooth surface imperfections.

Quote:
Originally Posted by TigerHawk
Try https://www.rshughes.com for that krylon primer, shipping is free at $99.00, under $99.00 itís $9.95 I believe.


I had bought a box (12 pack?) of Krylon Industrial Tough Coat Sandable Primer (aka KITC) once. It's great for larger surface areas that require a lot of sanding. But a 12-pack box is a bit of a commitment. I think I had ordered mine from Global Industrial:
https://www.globalindustrial.com/p/...9RoCb5gQAvD_BwE


The key is finding "Industrial Tough Coat" version of the Krylon primer, not the regular retail-store (crap) variety.

If you want to try a single bottle for starters, those can be ordered from here:
https://www.kljack.com/products/s00341/
-or-
https://www.grainger.com/product/KR...le-Spray-54TJ04

HTH,
a
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