Primer/Paint PROBLEM

Bruce · #1 01-21-2007, 05:16 PM

Can anyone tell me what is going on with this primer. It is EP 420 and I am getting all kinds of stuff in the setup. I do have a paint booth that I try to keep clean. I had to use 400 sandpaper and Scotchbrite pad to take down and the final paint looks great. Just wandering what this problem is.
Thanks,
http://<a href="http://img174.images... alt="" /></a>

cjensen · #2 01-21-2007, 05:40 PM

Looks like dust to me...

G-force · #3 01-21-2007, 05:55 PM

Are you wiping the surface down with a tac rag before shooting? Are you pouring your primer through a strainer before putting it in the spray gun? Is your paint booth dusty? If possable, wet the floor down with a hose when your spraying.

Bruce · #4 01-21-2007, 07:37 PM

I will do the strainer. Most of the particles were in the paint cup. Just had it happen with one batch so I don't know what it was. Will do the wipe down with tack cloth. Most of the time I use MEK and wipe it down with lint free rag. This is the only timed it happened so I was checking if maybe it was bloom but didn't know what that was. I DO no what orange peel looks like though.
Thanks for the suggestions !!

N674P · #5 01-21-2007, 07:48 PM

Quote:

Originally Posted by Bruce

Will do the wipe down with tack cloth.

When wiping with the tack cloth, do it lightly (like dusting) - putting pressure on the cloth will leave some of the tacky resin on the metal. You don't want that!

MrNomad · #6 01-22-2007, 09:04 AM

Ambient dust can travel into the paint from many sources which includes dust on shelves where no air is passing over. It has something to do with the electrical charge in the air.

I use my work shop to paint but I clean (blow off) the shelves the day before. Then cover the shelves with plastic so the charge in the air doesn't suck remaining dust off the shelves. Dampen the floor (like previously advised), use tack cloth from a auto body supplier (not Harbor Freight), strain, and have a final dryer before the regulator which is right at the gun. Cheap regulators will vary with compressor pressure so get a good one that retains the desired pressure irrespective of compressor pressure.

Wash the fluorescent lites the day before so they're bright, and make sure the air coming into the booth passes thru an air filter to purge the air of dust

Practice before squirting. That's what former wife's cars are for.

Bruce · #7 01-22-2007, 04:12 PM

I did turn off the inlet vent for fresh air and it did seem to help some. Thanks for all the advice. Isn't painting soOOOO much fun.

Good luck,

robertahegy · #8 01-22-2007, 04:37 PM

If you are using Polyfiber EP 420 you're putting way too much on. This stuff is almost transparent when applied. It does not coat and build up like most primers. One medium cross coat is all that you need. White looks like gray over AL. I used Polyfiber EP 420 White on my 7A. What color is that? I know they have White and Green. And Yes, always strain your paint.

Roberta

Ken · #9 01-22-2007, 07:23 PM

Remember to mask open areas on whatever you're painting. For example on the wings be sure to mask the open ends because dust has accumulated inside and will be sucked out when you spray.

Captain_John · #10 01-22-2007, 07:37 PM

I don't think it's dust.

I am going out on a limb here but I bet your top coat is a urethane finish.

I am also going to guess that the "EP" product is an etch prime.

If this is the case, you skipped a middle step. You didn't SEAL the primer.

The bubbles are air being trapped under the top coat because the primer was not sealed.

CJ