fish eyes - is brake cleaner better than panel wipe

[jcbadger]

hi

I'm having major fish eye probs in my cellulose high build primer coat. I've didnt have a problem with fish eyeing when laying down the first coats of primer using aerosol cans (for speed and convenience). I'm now using a gun and compressor to apply the high build primer and final top coats so I'm guessing the gun is probably causing the problem. I have two water traps fitted - one at the compressor and one directly at the gun. Everything is brand new from compressor right through to the gun - this is the 1st time I've sprayed. Maybe the gun is contaminated from the manufacturing process. I clean the gun thoroughly after use but maybe I need to inject some gun wash or panel wipe through the gun air ways. I've read the forum and see that brake cleaner can be used and is better than panel wipe - is this correct? Also, can leaving the panel wipe to evaporate instead of drying off cause fish eyes? thanks

 

[Chickenjohn]

Yes, panel wipe should be wiped on and wiped off or you may be leaving the contamination behind.

Also, were the spray cans you used cellulose or acrylic?? Some cans of acrylic primer from car shops can cause a reaction with celly primer from a spray gun-

 

[jcbadger]

hi

the aerosal cans were etch primer and zinc 182 primer. I did tests on a spare panel and there was no reaction between the different primers. I brushed on the cellulose high build primer over the other primers before I proceeded on the real panels on the car to test for potential rection problems. It's not just a few fish eyes were talking about - there are small clusters all over the panel. Needs sorting before I do the top coats

 

[the snooper]

fish eyes as you call it is silicone contamination have you used anything near to you panels, it wont be coming from the gun or compressor

 

[ajlelectronics]

I bet you are using the new panel wipe that is based on white spirit? Absolute nightmare to clean up. I use it now just to clear the worst off a panel, then go over it again with alcohol based wipe which leaves it clean. Any trace of the spirit on the panel will cause the reaction you are seeing. Ask me how I know if you like? :-)

 

[jcbadger]

thanks for the replies. go on then AJl tell us why -I'm intrigued. I'm using UPOL 20/20 slow panel wipe but I also used this before I sprayed my aerosol primer layers and it didnt cause probs with those layers.

My garage is full of the usual stuff on the shelves - lubricants, aerosal, etc so maybe the air being kicked around during spraying is picking up contamination. I've not used any spray grease, oils or waxoyl for months.

jc

 

[Xsite]

silicone can get on the surface from all many substances, we used to suffer with diesel fumes that are particularly bad.

If you have an issue with it, any good paint supplier should be able to supply you with anti silicone additive. A few drops into your paint solves the issue.

 

[jcbadger]

Now there's a thought Xsite - you mention diesel fumes. Do you get the same contamination with petrol fumes? I started the car up and drove it out of the garage first to create room to put up plastic sheeting in prep for spraying.

 

[edzt]

silicone can get on the surface from all many substances, we used to suffer with diesel fumes that are particularly bad.

If you have an issue with it, any good paint supplier should be able to supply you with anti silicone additive. A few drops into your paint solves the issue.

IMHO silicone drops don't work, you are just covering problems.

What are you wiping off the panel wipe with? I always used paper towels and lots of them

 

[jcbadger]

I'm using paper towels and I have just used brake cleaner instead of my usual slow degreaser to wipe down the panels, sanded back down (not to bare metal) to level out the primer and have test sprayed with aerosol primer (for speed of testing) over one of the areas where I got fish eyes - I didnt get any fish eyes appearing so hopefully I'll be lucky. I'll do a proper layer of primer with the gun again and if I get fish eyes then the problem has to be the gun or airline. Thanks all for your replies.