Weird spots in clear

[Evill Ed]

I just cleared my base coats with DBC 2082 on sunday. The base color for the tanks and fenders is orange, which I shot last thursday. I wet sanded it with 600 on friday and layed out my flames. I shot the flames with blue base coat and cleared an hour later with 2082. @ coats layed out great, good flow and smooth. About an hour later, all the surfaces, the blue and orange, had a pebble type texture. I thought it was slovent blisters at first, but it felt pebble like. I think it could have been overspray dust from shutting off the exhaust fan too soon. I had an extra table set up with fresh masking paper and it was covered with a fine gritty overspray.

I wet sanded the fender this morning with 600, it is flat and smooth. WHen I look really close, I think I can see these little cirlces still, I notice more on the dark blue than the orange areas, I think the blue shows it more since it is dark.

Has anyone ever had something like this with the 2082 clear?

I'm going to shoot my last 2 coats on tonight, and I hope it covers these littel spots and doesn't do it again.

Any tips or advice?

I am using good oil/water traps, 3 total and a disposable one at the gun. There is not moisture in the final 2 traps or the are lines, so I dont think its that.

BTW- I had to turn on the heat to lower the humidity, it was 85°f when I shot the clear with the 2083 activator, could the high temp with the fast activator have caused this?

Thanks,
Ed

 

[John Pierce]

Are you seeing little pinholes in the clearcoat -- I mean really small ones? PPG 2082 is rather notorious for solvent popping if it is sprayed too fast between coats, too heavy or with the wrong temp catalyst.

JP

 

[rex]

I'm thinking like John,it's the 'short sand'syndrome.If you just level the peel and stop shy of a complete sanding you'll end up with what looks like flat circles with a 'pinhole' between them.Great eyeballs man!The next clearing should level it.Don't worry about the overspray on the paper if you sprayed it in the shop,it's normal.The 82 is real fast stuff and I wouldn't use it unless you need the speed,I use 2042 for all of it now.Don't use the new 3000 clear unless you play with it first,it's real fast too but will solvent pop very easily.I haven't had a prob with it but it does flash and dry too quick for me on anything other than a bumper cover quickie or to cut in jambs with.It's worse than singlestage for popping.

 

[Evill Ed]

Yeah, I looked at it good tonight when I sanded and realized that it is solvent popping.

Now for my new problem:

I re-cleared it tonight. I don't know what possesed me to do it, but I decided to run a blue tack cloth lightly over the surface. I put on my tack coat and immediately noticed fisheyes everywhere, hundreds of them. I quickly added DX77(?) Fish eye eliminator to the cup and shot 2 more wet coats. The fenders got alot better, just a few left. My tank has alot more,
So now what do I do? I won't be able to sand all of these out, the ones that remained are deep.

Should I clean it with DX330, block it out as flat as I can , clean with DX330 again and re-clear?

If I didn't tack rag it, it would have looked perfect. I will never use a tack cloth again PERIOD.

Please offer tips and advice to correct this.

Thanks,
Ed

PS - I added an attachment. A pic of the fender before the solvent and fisheye problems.

Ed

 

[Evill Ed]

Update -
This morning I sanded 1 side of my tank with 600. It blocks out flat, I can cut the fish eyes out.

I will finish blocking it out tonight and then re-clear with 1 more coat of the 2082.

Any tips or advice appreciated.

Should I add the fish eye eliminator to the last coat as a preventive measure, or should I be okay if all the fish eyes are sanded out?

Thanks,
Ed

 

[rex]

Before you start sanding wipe it down good with 330 first.After you're done sanding wipe it down several times and make sure you keep wiping it off until it's dry,any wet spots are still lifting contaminants.I'd get a new tack rag and just lightly tack it,don't scrub with it.Open it up fully and fold and roll it into a puffy ball.Leaving it flat makes it easier for the tack stuff to stick to the surface if you press to hard.You'll have to add some fisheye preventer now since you already used it but only use the suggested amount.'Shouldn't' have any probs as long as you sand all the fisheye out.

 

[Evill Ed]

Thanks Rex, that's exactly how I'll do it.

Regards,
Ed