Sanding primer

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'68 Coronet R/T '68 Coronet R/T's Profile Board Moderator Posts: 9898 Joined: Fri Oct 20, 2006 12:40 pm Location: ARIZONA	Posted: Sat Jul 20, 2019 8:48 pm You need to post some pictures of your problem areas. It is hard to know if we are fully understanding your issues without the pictures. 1968 Coronet R/T ACTS 16:31
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Settled In

Posts: 78
Joined: Sun May 26, 2019 3:38 pm

Country: Sweden

Posted: Sun Jul 21, 2019 9:36 am

Il steve wrote:Primer is inherently thick. If you are not getting enough thickness it sounds like you are over thinning the primer.

Could be. I allways follow the data sheet and use a viscosity cup so im within specs.

But the most resonable explanation to my burn troughs should be that the primer is not thick enough.

I dont think thats why i have scratches showing because i know that they are not comming from the substrate.

Does anyone here use Standox Standohyd?

I will get pics next time i have the problem.

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Settled In

Posts: 86
Joined: Sat Oct 29, 2011 8:30 am

Country: USA

Posted: Sun Jul 21, 2019 11:58 am

Dokus wrote:
Il steve wrote:Primer is inherently thick. If you are not getting enough thickness it sounds like you are over thinning the primer.

Could be. I allways follow the data sheet and use a viscosity cup so im within specs.

But the most resonable explanation to my burn troughs should be that the primer is not thick enough.

I dont think thats why i have scratches showing because i know that they are not comming from the substrate.

Does anyone here use Standox Standohyd?

I will get pics next time i have the problem.

If you have like a 1.7mm tip for your sprayer you might try thinning the primer about the consistency of a household oil based enamel. You could have a pretty good build of primer even with one coat. Use a sanding block with 220 grit paper and it should knock down high places you can't see until you put the color coat on. If you are unsure of any body work you might have done use different colors of primer with each coat and when you sand it will highlight the high places when you sand through. You can do a lot of leveling with just primer.

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Top Contributor

Posts: 6234
Joined: Tue Sep 16, 2008 1:17 pm
Location: Pahrump NV.
Country: USA

Posted: Sun Jul 21, 2019 1:44 pm

DarrelK wrote:I'll just throw this out there with your last comments.... a "coat" of any substance is up to interpretation by the person applying it and the final mix/reduction of that liquid. I was a wood and finish instructor for about 19 years when I was younger. I taught many adult professional people and did a lot of spray demos. We ran the range of guys "hammering" on coats to some just literally "wisping" on materials. Manufacturing spec.s about "coats" are based on wet film (mil recommendations) application that dries and gets you to the final dry film. In simple terms.... my 2 or 3 coats may hide/fill in a lot more than your 2 or 3 coats..... I have never had 800 scratches show up in my base.

I was gonna make a Post saying exact same thing :goodpost:

Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.

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Dokus Dokus's Profile E-mail Dokus Settled In Posts: 78 Joined: Sun May 26, 2019 3:38 pm Country: Sweden	Posted: Sun Aug 04, 2019 12:48 pm I could not replicat my problem. I guess it was only high spots and i got annoyed. Last couple of parts i sprayed i sanded substrate with p180-320, primer p400, primer again, p500 and last p800. 3 coats of base. No scrathes. Finally!
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No Turning Back

Posts: 977
Joined: Mon Jun 20, 2011 3:58 pm

Posted: Sun Aug 04, 2019 5:54 pm

Dokus wrote: Almost everytime i get burntrough having to reprimer.

A famous person once said "Its not custom painting, its custom sanding" and I think his name was JCCLARK. Its also said that you should let the sand paper do the work.
If you are putting pressure on the sanding block, the panel may flex, or it may not be the same pressure everywhere, thus, you will get sand throughs. Course paper gets it straight, the other grits are just removing sand scratches. Use guide coat, sand all areas the same amount, don't try to get rid of all the guide coat, that defeats the purpose.

READ THE STICKY someone spent a lot of time to make it available for you.

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