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Old 04-14-2007, 06:09 PM
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Basecoat Imperfections

I shot the Nova today with SPI Black. The base went on very nicely, but it certainly picked up the sanding imperfections. I paid close attention to the final sanding before basing, using 500 grit paper. I thought it looked great. Should I take care of the visible scratches before clearing? I don't want to clear if it's going to compound the issue. If I have to clean up the sand scratches, then rebase, I'm screwed - out of product. I can always get more if I must.
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Old 04-15-2007, 07:40 AM
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In my experience, the basic rule of thumb is, if you can see it without the clear on, you will see it even better when cleared.

You said that you sanded with 500 before base. That base should have covered 500 scratches easilly. I have shot it over 320 before with no problems. You may not have sanded it smooth, leaving some of the previous sanding marks there. You may also have not let the primer sit long enough, and have some shrinkage in the primer showing up.

I would sand it smooth where you have the sanding marks and rebase it before clearing.

Aaron
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Old 04-15-2007, 08:54 AM
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Usually solid colors like black won't show the scratches after clear is applied. Metalic colors definately need to look perfect before clear is applied. If you're worried you can sand the base with 600 till smooth and shoot another coat of base then clear. Or test your worst spot by wiping some water on the surface and look to see it you can see the scratches through the water-the water will simulate what clear will do if that makes sense.
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Old 04-15-2007, 09:53 PM
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if all your seeing is 500 scratches then you fine go head and clear but if you can feel the scratches then i would sand those out then rebase
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Old 04-16-2007, 06:27 AM
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You MAY not see the scratches after clearing but if you do then you will have wasted your clear because you will need to scuff and re-base. Since you're shooting black I assume you shot two coats of base. Three coats of base will cover 500 grit scratches unless you have some320 scratches that you're seeing in your substrate. I recently had the exact same problem with 400 grit and two coats of black. Two coats covered just fine but the next morning I could see scratches. Blew on another coat .............problem solved. If you're used to reds, yellows, etc. that require three coats to cover, and you're usual substrate finish is 500 grit dry sanded, you know three coats will fill them. I have learned to plan on three coats of base reguardless of the color.
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Old 04-16-2007, 09:09 AM
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The Nova is a lot of car, and considering the undersides of the trunk and hood, jambs, etc., we ended up with a pretty thin base, about 1-2 mil. We cleared one panel to see what would happen with the scratches. The sanding scratches were covered. We are going to take the scratches down anyway by wetsanding the whole car and hitting it with another coat or two of base. That should give us what we're looking for. What grit for wetsanding the base? I'm thinking 1000P.
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Old 04-16-2007, 02:38 PM
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1000 will work, 800 grit is also good and a little faster, lucky for you that it's SPI base-if it was Dupont I'd say don't sand it.
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Old 04-17-2007, 05:35 AM
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If you have to wet sand a spot in your basecoat,
use wax and grease remover instead of water.
It works real good for that spot touch up,
especially if it's a little soft.
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Old 04-17-2007, 07:36 AM
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Quote:
Originally Posted by baddbob
1000 will work, 800 grit is also good and a little faster, lucky for you that it's SPI base-if it was Dupont I'd say don't sand it.
But has someone done a sanding test with the SPI? It may do the exact same thing!

Brian
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Old 04-17-2007, 10:21 AM
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DuPont is all I've ever sanded.
Been using it for over 10 yrs now.
If I find a scratch or imperfection before clearing,
I sand with wax and grease remover and 1200 paper,
let dry then clear. No reason not to
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