Question for the painting Gurus

[3404bbl]

My car is primered (2K) and pretty much ready to paint. When I wet sanded, I left a few spots about the size of a dime, where I sanded too far. I was planning on sealing it with the primer (reduced 25%).

Question is, is there a problem sealing over those small bare sopts?

[automan63]

What kind (brand and type) of primer have you used already, and what's under it in the way of metal prep?

[sunsetdart]

You should use the same primer as is on the car now. If not, just lightly dust the spots till they are covered . You will get dry areas around the spots you dust, and when you sand them , USE CARE as not to sand through again. For safteys sake, I would sand them dry with an 800-1000. Sanding them dry gives you alittle more control.

[3404bbl]

The primer I've used so far is Kirker 2k urethane. I sanded and primed over old paint everywhere except for where I'd welded in new patch panels in the quarters. I had a few spots (2 to 3 inches or less) where I had bare metal showing after applying filler over the area where I'd ground over the welds. In those bare areas, I used an etching primer, then used the urethane primer over it, and wet sanded the whole car. These bare spots came up in a couple of the areas around the patch panels, where I'd sanded too far, and there's also some bare spots along the sharp contours of the body (they're maybe 1/16")where I sanded too far there.

Other than these few small places, I'm really happy with the prep work and would rather not do any more sanding if I didn't have to. That's the reason I was wondering about just reducing the 2K and using it as a sealer over these small spots.

[Duster440]

You'll get lots of varying opinions. A seal coat over the entire car just prior to topcoating will take care of the breakthroughs. Otherwise, do what's been suggested and spray a little 2K over the spots and lightly resand. Another alternate would be to use a product called UPOL High Build which is surfacer in a rattle can. It's the only rattle can product approved by the paint manufacturers for use under topcoats.

[automan63]

You'll get lots of varying opinions. A seal coat over the entire car just prior to topcoating will take care of the breakthroughs. Otherwise, do what's been suggested and spray a little 2K over the spots and lightly resand. Another alternate would be to use a product called UPOL High Build which is surfacer in a rattle can. It's the only rattle can product approved by the paint manufacturers for use under topcoats.

    With the exception of sealer. Never liked sealing a car before paint, I find I have die back because of the addition of more solvents. My opinion would be to just dust in the bare spots, lite sand and paint and clear (assuming its a two stage color). JMHO  Jeff.   P.S. Love UPOL products, real time savers.