Sanding epoxy primer before 2k

[drdan]

I epoxy primed a few panels and have fish eyes in spots. Maybe I didn’t wait long enough but they were clean.
My question is can I sand those areas then a light buzz over the panel and apply my 2k or should I re epoxy prime first?

 

[Barry]

Shoot your primer and the first coat will take care of them.
I prefer you don't unless you want to recoat as mils with epoxy is key.

 

[Chris_Hamilton]

I epoxy primed a few panels and have fish eyes in spots. Maybe I didn’t wait long enough but they were clean.
My question is can I sand those areas then a light buzz over the panel and apply my 2k or should I re epoxy prime first?

It's cratering from spraying the epoxy too wet on the first coat. Spray your first coat of epoxy medium at most. Like you would with a metallic basecoat.

 

[Lizer]

I don’t think it matters which coat. If air hits the epoxy and evaporates the alcohol too fast the pigment will migrate. I’ve had pigment migration on 2nd and even third coats before. They’re just not as obvious.

 

[drdan]

So I clean the panels thoroughly and apply two coats of 2K and I’m gonna let them sit for about a month. Thank you for all that reply.

 

[MJM]

I epoxy primed a few panels and have fish eyes in spots. Maybe I didn’t wait long enough but they were clean.
My question is can I sand those areas then a light buzz over the panel and apply my 2k or should I re epoxy prime first?

Pictures are always helpful with troubleshooting painting questions. Since you feel it's fish-eyes and someone has recommended to apply a medium first coat, you're probably asking yourself how to achieve that.

First, what type of spray gun do you have?......how many turns out from closed for the fluid adjustment, and how many turns out on the fan adjustment?......

Next will be how far away from the panel are you spraying, and how fast or slow are you moving the gun?

How your spraygun is set up and how fast or slow you move while spraying is critical in obtaining a good smooth, flat coverage of paint.

Example...... setting up a spraygun with a narrow fan pattern, lots of fluid volume, and slow moving spray pattern will pile on the paint causing many issues, such as, crating and runs. I associate fish-eyes with contamination, such as water or oil in the air supply.

So tell us about your gun set up and air supply? Remember, pictures are helpful.

 

[drdan]

Pictures are always helpful with troubleshooting painting questions. Since you feel it's fish-eyes and someone has recommended to apply a medium first coat, you're probably asking yourself how to achieve that.

First, what type of spray gun do you have?......how many turns out from closed for the fluid adjustment, and how many turns out on the fan adjustment?......

Next will be how far away from the panel are you spraying, and how fast or slow are you moving the gun?

How your spraygun is set up and how fast or slow you move while spraying is critical in obtaining a good smooth, flat coverage of paint.

Example...... setting up a spraygun with a narrow fan pattern, lots of fluid volume, and slow moving spray pattern will pile on the paint causing many issues, such as, crating and runs. I associate fish-eyes with contamination, such as water or oil in the air supply.

So tell us about your gun set up and air supply? Remember, pictures are helpful.

For primer I use a starting line Devilbiss. 1 to 1 1/2 out on fluid, about 2/3 spray pattern. 25 psi.

 

[MJM]

For primer I use a starting line Devilbiss. 1 to 1 1/2 out on fluid, about 2/3 spray pattern. 25 psi.

I have no knowledge with that particulure spraygun, though the fluid seems a bit on the low side. I'd bump it up to 2 turns out from closed. If you feel it's piling on the paint to much, increase your spraying speed, or go back to what settings worked for you originally. I'm still inclined to say your seeing fish-eyes due to contamination from your air supply or air borne silicone.

If you're still seeing fish-eyes after spraying 2k primer, you have either contamination from your air line or from some type of air borne silicone in the painting area,

 

[Lizer]

99% of the time when somebody says they’re seeing “fisheyes” in epoxy they’re actually seeing pigment migration. Spraying at 25 PSI he’s probably got the gun too close to the panel. You can make epoxy pigments migrate without spraying a drop of epoxy; just straight air.

 

[Treeslayer]

i have that gun. have not used it for this epoxy yet........ i am usually inclined to run close to wide open every thing. i am reading here, hoping to learn and avoid mistakes.