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-   -   Painting nightmare - help! (http://www.vansairforce.com/community/showthread.php?t=34344)

rjcthree 09-21-2008 12:16 PM

Painting nightmare - help!
 
Hi everybody,

I am painting my interior parts, such that I can finish my canopy.

I chose Stewart after visiting with them at OSH, ordered the single part primer and single part interior, they mixed a nice color for me.

Sprayed the primer over the past couple days via an HVLP touch up gun, remember the parts are small. No problem. Went well.

Set up today to reshoot the color. BAD MOJO.

Lightly touched the panels with some virgin scotchbrite, touched a couple of bug spots/orange peel with a 220 garnet, wiped down with prepsol and blew everything off. Mixed paint to 25 sec on an M-50 cup, threw some paint on cardboard to get the flows right, and started painting.

Fisheyes - everywhere, immediately. Light or heavy.

Since it's a waterborne, I started washing.

Shot it again 30 minutes later, same result.

HELP!

I'm wondering if the prepsol was a bad plan.

:mad::mad::mad:

Rick

szicree 09-21-2008 02:29 PM

I'm voting for water or oil in your air supply. I'm assuming you've got some type of filter/water trap on your air lines. In addition, the best insurance you can have is the little plastic screw on filter that goes right at the gun.

cytoxin 09-21-2008 03:08 PM

did they recommend prep sol, its a petro base. (mineral spirits) doesnt seem to two would get along. you didnt have fish eyes before so i wouldnt think water/oil in the air supply. if so try one of these http://weilerwelding.com/shopsite_sc...otorguard.html
you can use the small ones that screw on to the gun or the bigger ones that go on the wall with the toilet papaer roll in them.
for years i used one of these http://www.harborfreight.com/cpi/cta...temnumber=1118
and nothing else. then i found the little motor gaurd orange disposables, then i used and then i added the t/p filter.

ohh and wait till it happens on the wing.

good luck.

cytoxin 09-21-2008 03:18 PM

you may want to try cleaning it with amonia or alcohol.

rjcthree 09-21-2008 03:18 PM

Update
 
Ok, here's an update:

I have a 2-hp oiled compressor with an air dryer, desiccant style, on a 50gal tank. I pulled no residue from the tank on the last drain last week, when I did a compressor PM. The in-line filter is already on order for my new DeVilbiss FL3 ;)

IF I:

1. Shoot the color coat over alodined alum, it goes well.
2. Shoot a second coat over the first on alodined alum, the second coat fishes badly. Very odd. - update - I found a very light oil coating over the fisheyed paint over the first coat. Just enough to give it a shine, it wipes away. Part of me wonders what the pigment carrier is?
3. Use simple green to wash the oil base off the PRIMER, it's still bad.
4. Shoot color over primer I shot yesterday but have not touched with anything since, it fishes. Bad.
5. Use MEK to wipe down the panels with to without prepsol exposure - fishy again.
6. Use a BRUSH to apply paint to a primed surface -the primer hasn't been touched since it was sprayed yesterday about noon. Unless it is applied in a fillet(very deep) it fisheyes.

OK, one other finding: I may have used about 2oz of TAP water to thin down with, the other 2oz distilled. Got my bottles mixed.

#2 kinda freaks me out. As does #6, which says it's a PRIMER problem, not a paint problem, IMO.

GRRRRRR.

Rick

allbee 09-21-2008 03:43 PM

I had the same kind of problem, didn't matter if it was with the rustoleum or the Stewart system. It seemed that the stewart system was better for NOT doing this tho. What I found was silicon being my problem. Make sure and use new rags, used ones can get silicon from the wash. Next wipe everything down before painting with MEK. Make sure you use a nice filter- dryer before the gun, go to the paint shop and get some desposible ones, mine are orange.

fstringham7a 09-21-2008 07:11 PM

RE:Call Dan
 
Rick

Everytime I have painted my self into the problem Stewart paint System corner I have called Dan at http://www.stewartsystems.aero/contactus.aspx and he would give me great advice as to the problem and how to solve the problem.

Fran @ 1L8 ...RV7A... paint:eek:

brianwallis 09-21-2008 11:00 PM

silicone
 
I cannot tell you how little silicone you need to really mess things up... we are talking about a pizza place down the street spraying their pizza pans can give you a really hard time. I've seen it. This may or may not be your problem.
Best
Brian

chunt0 09-22-2008 12:03 AM

Mist coat?
 
Did you do the first very light mist coat? That is a key step with Stewart two component EkoPoly--not sure if the single component process differs. The idea with the two part stuff is to open the gun slightly more for each subsequent coat. Too heavy an initial coat causes something like what you described.

Rivethead 09-22-2008 05:25 AM

How much silicon have you used while building? RTV or otherwise any old rags? This sounds like dryer sheet contamination (Bounce is silicon). Have you been using any old towels from the laundry to wipe things off with.


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