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Old 02-08-2013, 01:42 PM
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Originally Posted by Riot Racing View Post
I considered that but kind of doubt this is what caused it. The first pieces I POR15 had this same issue and I only applied 1 coat of POR15 to that surface and the bumps were even worse than these pieces.

I used a wet rag to clean the sandblasted metal. I then used a Tack cloth once the metal was dry to make sure there was no contamination on the metal. I am skeptical that these bumps are lint.
I looked at close up pictures and I can clearly see contamination on metal before POR15 was applied. You should've used some scuff pad/sand paper to knock down whatever is on there (looks like some rough spots in the pictures) and then blow off and tack it real well.
If you had clean blasted metal you should've just used coat of epoxy primer and then a couple coats of high build urethane primer and sand that and it would've been ready for paint.

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Old 02-08-2013, 01:51 PM
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Originally Posted by Riot Racing View Post
POR15 instructions state to rinse the parts with water after each step of the process i listed

Surface preparation: Rusted surfaces are best; seasoned metal and
sandblasted surfaces are also good. Surface must be dry and free of
grease, oil, or other foreign substances.
TO COAT SMOOTH METAL SURFACES: First use Marine Clean to
clean and degrease the surface, when clean rinse with water and allow
area to dry. Second spray Metal Ready on surface full strength, keep wet
for 15-20 minutes then rinse with water and allow to completely dry. Use
of “rust converter” products is not recommended as they may affect
bonding of POR-15 to metal. POR-15 likes to adhere to surfaces with
“tooth” rather than smooth, glossy surfaces.
STIR CONTENTS THOROUGHLY before painting. Do not shake.
Refrigerate unused portion of POR-15 for longer shelf life.

It states to rinse off with water after you apply marine clean or metal ready, did you use any of those products? Simply rinsing blasted metal with water will just flash rust it and will cause problems down the road.
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Old 02-09-2013, 10:11 AM
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I'm starting to think that people are not reading my post in close detail...

So as a report back: I chipped a few of those pimple looks spots ont he surface and I do not see any rust or other contamination under the pimple. This makes me think the problem might be air. I want to talk to the POR15 company and see what they think. Again, im not really worried since it wont show but Id like to learn how to use this product better.
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