Any Qualified Spray Painters On Here?

[KE30_KE35_KE55]

I am painting 2 pack for the first time and I keep getting pin holes appearing 1-2 days after painting any ideas ??? I left it a week rubbed it back and it was like mirror, then I painted it looked great 2 days later these tiny pin holes start appearing.

[Medicine_Man]

Depends how big the pinholes are, If they are small and lots of them all over it could be solvent boil (Cause is too much hardener / too many coats too quickly) or Silicone (Due to not cleaning the surfaces properly it makes the paint pool out as if it is not bonding)..

 

Can also be caused if the undercoat isn't rubbed down properly or has been sprayed too dry..

 

Can you get any pictures of the pinholes at all?

[Trev]

Sounds exactly like silicone, Give silicone drops a go, My brother is a qualified panel beater so i could ask him if you want.

[kangaroosa]

I've only sprayed Acrylic on my Corolla's, but i found that Silicone based problems generally happen almost there and then when spraying...as opposed to a day or two down the track. Thats not to say it doesnt happen, just that it hasnt happened on that time frame to me.

2pac is unchartered territory for me, so i can't comment on the hardener side of things.

[Trev]

Being 2pak you are baking it arent you?

[KE30_KE35_KE55]

Being 2pak you are baking it arent you?

 

It has been over 40 for the past few days it is baking well in the sun.

[Medicine_Man]

so can you get some pictures at all?

[kangaroosa]

I just read that you should let the paint settle for a few seconds after mixing it to allow any air bubbles to rise (using a gravity fed gun). Something that I have never done, and havent had drama's with not doing do. Maybe its possible for 2pac....but it seems a bit far fetched to me. Its just another possible scenario i guess.

[WinKE55]

Pin holes such as something is on the paint, or pin holes down through the paint?

 

If it's on the paint - Silicone/dirt/etc

 

In the paint - Not sure lol. Maybe use a better paint? Or mix it better?

 

 

You might have to ask someone at a paint store if no one is qualified here type of thing, but pictures would help a lot.

[KE30_KE35_KE55]

Depends how big the pinholes are, If they are small and lots of them all over it could be solvent boil (Cause is too much hardener / too many coats too quickly) or Silicone (Due to not cleaning the surfaces properly it makes the paint pool out as if it is not bonding)..

 

Can also be caused if the undercoat isn't rubbed down properly or has been sprayed too dry..

 

Can you get any pictures of the pinholes at all?

 

I don't think it is silicon as i prepared the surface first with series 2 acrylic that went on and rubbed out OK. I then left it for about a week.

I am using glasurit paint, ICI auto color ms hardener, and a good quality thinners bought for the job mixing in the spay gun bowl 2 paint 1 hardener, .05 polyurethane thinner.

 

Like i said it happened the first time so i let i sit for a few weeks it hardened up, I rubbed it back ultra smooth and re coated 2 days ago the ambient temp was 40 Oc.

 

Does MS hardener go off?

 

I will post some close up pics tomorrow.

Edited December 30, 2007 by KE30_KE35_KE55

[KE30_KE35_KE55]

I just read that you should let the paint settle for a few seconds after mixing it to allow any air bubbles to rise (using a gravity fed gun). Something that I have never done, and havent had drama's with not doing do. Maybe its possible for 2pac....but it seems a bit far fetched to me. Its just another possible scenario i guess.

 

I'm new to 2 pack so I don't Know I have Never seen anything Like this they look like pin heads. defiantly were not there 4 hours after I painted it.

 

 

Thanks everyone

 

I will post some pics tomorrow.

[mattress]

A mate of mine is a painter and i've heard him say many times not to mix brands. If you are using glas paint use their hardener primer etc. Maybe thats not your problem though...

 

In all seriousness, you're worried about pin holes and you're painting outside? My mate whinges about the amount of crap he gets in his jobs and he sprays in a booth thats cleaned regularly...

[KE30_KE35_KE55]

I have an extraction fan in my shed I spay in my shed put it in the sun the next day.

here are some pics mostly of the reflection I found it near imposable to get good pics.

[Trev]

Its definately fish eyes which is mostly caused by silicone, oil & water, It can also be caused from leaving wax and grease remover on too long, I don't know why its coming out a few hours later but i did a paint job where it came out when we finished the car (paint place was selling thinned paint and we werent aware so my mate mixed it up with thinners, It still had a good consistency), Do you have a water seperator on the compressor?

 

Thats all i can say as its not my field, Good luck.

[Medicine_Man]

The old man had a look and recons its silicone contamination. Could possibly be from the car being polished with a silicone based product before, A rag you used to clean it had silicone on it or someone that was in contact with silicone touched it.

 

He recons to Rub out as much of the defects as possible

 

use some 800 grit sandpaper, then 2000 grit & prepsol (Wax and grease remover) to clean it up with a fresh rag.

 

He said it would be OK to paint straight back over the top as it is fresh paint.. (No need to re-prime it)..