The Stovebolt Site Forums The Shop Area Paint and Body Shop paint prep problems.

I worked all day yesterday sanding my primer and filling little dings and waves here and there. It was coming along nicely.

I reprimed both doors and rear fenders. The primer is much smoother now. Tonight I thought I would just sand one door with 400 grit. Well it was coming along great when a little rough spot appeared near the crease in the upper part of the door below the window. The more I sanded the bigger it got.

When I finally spread it across the entire door I stopped.

I think this was due to the conditions, I painted yesterday when it was raining. The truck was closed up in the garage for the whole day as I was off on another job. I just don't think it cured completely and I rubbed through it where the crease is and the paint is naturally a little thicker there.

What a Pain! the rest of the door looks fabulous...best body work I have ever done.

I will let it cure a few days and try to re sand and smooth out the rough spot.

Any advice is alway welcome.

Rich

When you say rough spot, do you mean the primer was still soft?
What kind of primer are you using?

I didn't realize it was still soft I was sanding for a few minutes. I think the issue is wit the humidity and cool temp it didn't really cure. By the time I realized the rough spot was soft it was too late. I hope in a day or 2 I can sand it out.

What kind of primer are you using?

Hi, Rich, Is there any chance you did not mix your catalyst properly with your primer? That is if your using something like 2k primer.. The stuff I use will dry in 20-30 and I can sand it.

I did not think that humidity would bother primer all that much. I do know for sure it does not mess with the stuff I use. Of course I am not talking about spraying it in the rain.

This is a single stage oil based primer.

I let it set for another 24 hours and it was fine. It sanded very nicely. I am not sure if iot was the damp or the cool temp but it seems fine now.

I am in the midst of sanding and glazing now. I think I am about 30% done on my way to paint. Of course the more I sand the more imperfections I find to fix. But I think it will be worth the time and effort.

One question I have always sanded metal with 60 grit before priming. I am sanding my primer with 320 to 400 grit before paint. It seems very smooth. Will I have adhering trouble with the paint if the pimer is that smooth? It is almost glossy.

Rich

If you are painting a solid color, 400 grit is fine, if it's metallic paint, you really need to sand with 600.

180 grit is good for bare metal. You primer will fill the 180 scratches a lot easier than 60 grit.

"This is a single stage oil based primer"

Rich, just curious...are you using tractor/implement enamel?

Oil based?