Final Sanding Primer for Black

[jetfreak]

I have a 69 Camaro that the hood flew open on me :steering: and i'm having to do a lil repair work to the fender and hood. That being said, I have primered the fender panel and hood with k-36 and final wet sanded the primer using 600grit. My question is when I topcoated the primer with PPG DBC black and bring the panel in under flourescent light I can see the 600 wet sand marks. Can someone please help in the proper way to final sand primer for DARK colors. Is 800 wet to much ? I only got one coat of black on today and decided not to add a second coat until I understand why I can see the scratch marks. I will admit it looked really good outside but as soon as I put the fender under the lights I could see it. Will adding a 2nd coat start to hide the scratches?

I am using an Iwata LPV400 with 1.3 tip. It is a new gun and im trying to get used to it. Its not a very fast gun (to me) but it laid the top coat down very thin and very smooth. I was really impressed. I have a 30 gal compress 7.1 cfm @ 40. I set the regulator at the gun to about 16-17 psi.

Any help would greatly appreciated.
Thanks
Sean

[Len]

Hi Sean
So you sanded with 600 and applied one coat of base, is that correct? If so then yes a second coat will help fill the scratches and you should apply at least two coats of color prior to clear. If you still can see a slight scratch after two coats don't worry about it, as long as the base has achieved coverage then the clear will make it beautiful.

That compressor is working hard and may generate some moisture and may allow the pressure to drop. A pressure drop will result in heavier orange peel and probably some runs. Be sure to allow you first coat of clear to dry to the touch before applying the second. This will help prevent runs then the orange peel can be sanded and polished to make the job better.

[jetfreak]

Hi Len, Thank you for responding so quickly. Yes I wet sanded and the scrathes are very fine but you can seem in the angle of the light showing.

Is wet sanding with p800 bad? Or just not necessary.

The lflowout on the paint was very smooth... No orange peel. Well at least not on the fender.

Thanks

[Len]

Hi Len, Thank you for responding so quickly. Yes I wet sanded and the scrathes are very fine but you can seem in the angle of the light showing.

Is wet sanding with p800 bad? Or just not necessary.

The lflowout on the paint was very smooth... No orange peel. Well at least not on the fender.

Thanks

Is it base/clear or single stage paint? If it was base/clear did you have both applied when you saw the scratches?

[jetfreak]

It is BC/CC. The black im using is DBC 9700. No clear coat applied yet, just one coat of base.

thanks

[tech69]

I think you'll be fine and I think that's exactly what Len was getting at. The clear will hide it and you'll never know it's there. Just spray more base before you clear.

When I do black cars I spray more guide coat for a more thorough job. If I have already entered a scratch below 600 then I'll guide coat x2 with 600.

If your paint has cured prep it for more paint and throw on another coat or two then clearcoat.
Should be fine.

Note: just make sure it's a block scratch from your 600 and not a rogue scratch. A rogue scratch will be deeper than the rest and usually comes from clogging, torn paper, or god knows what. If it's a rogue scratch you'll have to guide coat that plane or section til it's gone, which could take a while. Most likely just seeing your 600 grit scratch and freaking out on the first coat of base, which is great cause you're paying attention to detail. :p

[jetfreak]

I got 2 more coats on and maybe im just being anal...but I can still see the 600 scratches with the light at the right angle. I am gonna proceed with clear and hope it gets covered.

Thanks
sean