Sprayed primer

stevegray · Apr 22, 2003

I just primed my 72 on Saturday. All products used were PPG. I cleaned everything and put plastic on the walls. I have a few small cracks in the body (did not see them when sanding) that the primer enhanced. I also had some dirt get it in. I used all the primer (one gallon). It has two coats.

What can I use to fill the cracks with out having to reprime?

After I was done there was a lot of mist in the air and it settled on the car.I have the car up on jacks and the doors off and wet sanding would be a mess in the garage.

Can I dry sand it and what grade of paper would I use?

Should I keep the A/C running to keep the mist down when I spray on the color and clear?

I am on vacation next week and want to get the paint on the car while I am off.

Thanks for any help you can give.

JimD · Apr 22, 2003

Any idea what layer the cracks are appearing in? Old bodywork, prior paint or prime? Doesn't really matter if not fixed correctly it probably will come back to haut ya. I fooled around with the overspray problems until i installed exhaust fans and roof vents. I now get almost zero overspray. The a/c blowing would probably magnify the problem and clear is much stickier. Same with the dirt, it would help to wet the shop floor.
Your paint/material has tech sheets that that specify a final sand grit to achieve max adhesion/smoothness.Usually 320/400 wet. The sandpaper won't last as long dry as will wet. How about using a sponge to keep it wet, the water will fall just around the car and sweep up when dry.
Probably not what you wanted to hear but the airflow problems have to be addressed.

stevegray · Apr 22, 2003

I never saw the cracks in the body. They appeared after the primer was applied.

I think I will try the sponge method for wet sanding.

I do not know about the exhaust fans. Maybe I will look at the ones at home depot. It is about 900 sq ft garage. Any one know what size fan I should get? I can prop the fan under the garage door and seal the rest of the opening up to keep the dirt out.. The ceiling is not a option since it is steel.

Any other ideas?

Thanks so far.

JimD · Apr 22, 2003

Catalized Urethane primer right? I know exactly what your mean, don't fill it sand them out, respray if necessary. My roof is metal also, not a fan up there just roof vent. The airflow thru the shop created with the fans, keeps it going out. Airflow is important too, cause you many problems like no flow out, solvent pop<--not funny, been there. Exhaust hi up on the side would help. Trick is to get rid of it before it lands back on the surface.

stevegray · Apr 22, 2003

Thanks.

Sprayed primer

stevegray

JimD

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JimD

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