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Old 09-27-2009, 09:45 AM
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SPI epoxy primer sealer ?

I have virtually no experience so I'm assuming it's something that I have done wrong. Yesterday evening I mixed up and sprayed the sealer just to protect the bare metal it worked great. This morning I went and sprayed the other side of the vehicle and from what I've read it appears to have or be covered with fisheyes small about 1/8" diameter. Since I'm not going to be doing much with it now for about a month. 1.What caused it? What in the future can help with it? Do I have to sand it all off before doing anything else? as I said it probably will be a month till I get back on it. Both sides were down to basically bare metal. It was in the mid 90's yesterday and today around 80 when I sprayed it. Thanks, Eric

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Old 09-27-2009, 10:21 AM
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Some form of surface contamination would be my guess. Did you clean the surface real well with a wax & grease remover and wipe it dry with a clean cloth before spraying?

Vince
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Old 09-27-2009, 11:01 AM
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I didn't wipe with anything it I just went over it with sandpaper to remove surface rust and wiped it with a paper towel. Do I or will I have to take it back down to bare metal before I restart the project or once the paint is fully cured can I just sand it smooth and reshoot it? I did the same to the other side and that worked so well that's why I'm wondering what went wrong and what to do in the future, I'd hate to have really had a paint job go bad like this. Thanks
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Old 09-27-2009, 01:08 PM
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You should ALWAYS wipe it down with a wax & grease remover before applying any top coat. I would remove it all and re-shoot. Paint is too expensive to not do it right.

Vince
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Old 09-27-2009, 01:42 PM
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Thanks, It's a fairly small area so it won't be too bad,thanks again for your help.
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Old 09-27-2009, 02:32 PM
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What product exactly did you spray on the bare metal?
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Old 09-27-2009, 08:34 PM
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It was the 2 part epoxy sealer. As I said I'm sure it was my issue, The other 2 areas woked fine I guess I was just lucky. So I'll get out the sanders and have at it.
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Old 09-27-2009, 09:24 PM
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You scared me a bit there, unless the epoxy is reduced about 20% or more, we generally just refer to it as primer. Most 2K sealers are not appropriate for bare metal unless they are epoxy based.

You may not need to strip all of that primer. Just sand off the part that went bad. When you sand the primer to put additional coats of primer, examine some random areas where the metal or substrate is showing to see if the edge of the primer is tearing away, or if it is sanding to a very thin featheredge without pulling away. This will tell you a lot about how the material is adhering.

Vince is not wrong, though. It would be safest to remove it and follow procedure more carefully.
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