spray can paint fisheyes fix? and what to wipe with before covering primer?

[Jonk67]

Frustrated, been working on stripping, cleaning, primering? and painting my engine bay for months. I finally covered all the bare panels with Mar-hyde self etching primer and started spraying with Eastwood underhood black. I guess you call them fisheyes?, started appearing, I could see the primer peeking through in spots like there was wax or oil on top of the primer. I travel every other week and thought I had wiped it down after the last primer coat but guess not.

What next, I'm guessing I need to rough it up with some fine (1000 grit?) sandpaper or is synthetic steel wool be ok? What's the best chemical for final wipedown post sanding?

This is the best pic I could could get with my phone,

I can't find my camera anywhere and it's got a lot of pics on it, getting worried.
Jon

 

[Midlife]

With any time between primer and a top coat, you must wipe the paint down with wax/grease remover. Waiting a week is simply too long for crap to contaminate the surface. I wipe the surface down immediately before spraying (after waiting 1-2 minutes for the solvent to dry). The contamination is what is causing your fisheyes.

 

[lethal289]

+1 on the wax and grease remover right before. I think you would still see the aftermath even with some 1000 grit. If i were you, i would probably take some lacquer thinner, and wipe the effected area down pretty good, hopefully the rattle can paint is still fresh enough to come right off on a rag.

 

[Jonk67]

Thanks guys, that's what I figured, I'm doing so many things at once to the car I couldn't remember if I had wiped down within the last day even but I guess it's best to wipe it down just prior to the paint. If the laquer thinner doesn't do anything can I still rough it up? please don't tell me I gotta go down to primer or bare metal again...
Jon

 

[tarafied1]

easy-off oven cleaner will strip paint off. If you don't strip it off, sand and fill primer and sanding it, priming and sanding until you can't see the "spots"

 

[lethal289]

Its probably best to wet sand with some 400 and go from there. Maybe even 220 if you dont mind having to spray a little more primer. What I think is the best to do is get the contaminated paint removed from the area. IMO, 1000 grit is way to fine.

Paint can be a PIA, Sometimes if there are even any silicates in the area, like maybe a previous Armor all application in the room / garage, you can get fish eyes to show on a large surface. Its always best to be as clean a possible for the optimum result. Good luck.

please don't tell me I gotta go down to primer or bare metal again...

I wont, just do as much as it takes until your satisfied the area is clean. You should be fine. Just dont rush it.

 

[Jonk67]

I'll try a couple of the suggeted fixes tomorrow, thanks guys.
Jon