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Clearcoat Problems (Bubbles & Blisters)
Sunday
9:02 am
Patrick Demele
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Forum Posts: 4
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Sunday
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Tony,   How are ya?  Are you in Texas yet?  I would sure like to come by and shake your hand one day.  Anyway, have a question about a problem I had.  Let me tell you the end results, then I will tell you the steps I followed so you can possibly lend a solution.  My problem is that the clear coat on my Motorcycle Fender has bubbled or blistered with tiny bubbles. 

Steps,  (this is an ABS plastic fender–Yahama)

1.  Sanded down to the plastic, removed all of the paint.  Final sanded with 1200 grit before spraying with primer.

2.  Sprayed primer, stuck great.

3.  After more prep, sprayed black base coat

4.  After flash time, sprayed a Pearl/Clear Mix to get a black/blue-Purple effect (2 coats) came out great.

5.  After flash sprayed 2 coats of regular clearcoat. 

6.  Ley dry for about an hour, until not tacky, then carried it outside to bake in the sun.

7.  Went out to check it 2 hours later and it was all blistered up.

Tried to sand it but the blisters or bubbles go all the way down.  My question is:  Would the sun cause it to blister or bubble.  They are not big, just the size of little air bubbles.   I have a picture of how it looked prior to the bubbling and after but I haven’t figured out how to upload them.  Never seen it do this.  Just want to know if it was the sun or something else.

Any advise you can give would be greatly appreciated.

Ohh  by the way, the sun was beating directly on them and it was about 95 F.

Thanks

Patrick Demele

Sunday
10:58 am
spacemontyt
England
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Wednesday
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Hi Patrick,

Don’t get many probs’ with the sun in the UK. Depending on wot type of primer u used, (somtimes wait btween 2-12 hrs) b4 prime I would hav 4/600 max 800. Did u use an adhesive, or a flexy promoter?? Wot’s no 3. If 4&5 wern’t thouroughly dry u somtimes get an immediate reaction, or it can happen much later.Wot type of thins/reducer did u use?

The sun shouldn’t hav caused the prob unles 1 or more cts wern’t dry.BUUUUTTT if all above was defo ok. I would suggest it’s water in the line x/nope,contamination @3. Humidity VERY possible had it rained?

The only probs u could have had with sun, IIFF cts wern’t dry, u baked the top suface 1st the undercts can only go 1 way, dwn & possibly cause som tiny spots or even blistering on top

U know wot u hav 2 do!? Yep go bac 2 yr primer.IIFF u left it a while u might get away with hi build, I wouldn’t.

com on bac @ let us know wot xactly u did thinners etc good luck,col  + ps yep that sounds goood 2 me call me col were all friends c u LaughLaugh

Sunday
11:21 am
Patrick Demele
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Forum Posts: 4
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Sunday
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Thanks Spacemontyt.

I suspect that it was the sun. I didn’t look at the clock before I put it out in the sun.  The wife says it was only 45 minutes since my last clear, then I put it out to bake.  I will end up repainting it all over again.  No problem though, it is a good learning experience.

Number 3 was additional wet sanding to the primer to make it a little smoother.  Only waited about 10 minutes between each coat, so that may have been a problem too. 

Don’t know but the statement you made about the blistering sounds logical. 

Thinner?  Well, to tell you the truth, I count on my paint rep to give me the right stuff.  See, I am in Korea and the labels, don’t exactly have english.  But I have used it many times and it has never failed me yet.  I buy a matching set from my paint rep.  The primer, base coat, clear coat, thinner, and hardeners are all from the same Manufacturer (KCC) a Dupont product. The only other thing I use, which has never failed me is the Pearl and Candy flakes/pigments from Paintwithpearl.com.  Seems to mix with just about anything and it looks great.

Weather conditions: 

Hot Hot and more Hot.  About 95F today with about 30% humidity.  Not sure that did it though, it was in a garage, where the temperature is about 18 degrees cooler.  Anyway, thanks and I hope this is the problem (Sun).  I will attempt to repaint it this week and leave it in doors, if it does the same thing, then I will update.

Thanks again

Patrick Demele

Sunday
2:53 pm
spacemontyt
England
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Forum Posts: 216
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Wednesday
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Hi Patrick,

If u were to do that in reverse, dampness then the sun came out as I did yonks ago with 2 red bumpers’, after 3hrs.I then came out 2 find that they had changed 2 pink & had several hundred tiny craters. Just 2 giv u a LaughOL & 4 future reference 4u  & the guys, annoying, yet easy fix. B careful of yr dry times, don’t take short cuts. Personally I would leave in garage overnight.

Everything else seems 2 b honky tonk, @ those temps obviously don’t use a fast thins. I’d go slow 2 med, givs it more time 2 settle/level. Just spray a bit faster or yr get runs c u, col

Monday
10:17 am
James McNally
Australia
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Wednesday
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Hi Patrick/Hi Col

I did have the same reaction on a rear bumper I did last year, not thinking I sprayed and all was well but when I finished the job I just parked the car outside in the sun and it did bubble up also, Not big bubbles but little tiny ones.

The entire clear looked like it had a bad case of acne very tiny air bubbles everywhere that had burst.

I sanded right back and redone the job but this time i did not park outside for around 4-5 hours and all was well.

I might have been the sun depending on the tempuature I suppose it was high 20c into 30c

I was told later buy the paint people should not have baked in the sun so soon

Don’t know what the temps get to in England Col but have been led to beleive it is alot less than Australia.

Might have something to do with why you don’t have that problem.

 

Col here’s a question for you though, when spraying in a booth at what stage do you turn the heat on to bake the paint?

 

Cheers James

If owning a car with a nice paint job is a dream, then turn the dream into reality.
Sunday
4:04 am
Patrick Demele
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Forum Posts: 4
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Sunday
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Thanks all,

I have come to the conclusion that I put it in the sun before it was dry and that is what caused my problem. I sanded it back down to the plastic, painted the entire thing with the same basecoat/pearl/clearcoat that I had used before, left it in the garage overnight and then next morning it looked great.

Yesterday, I color sanded and buffed it out and it looks like new. Beautiful color and a fabulous shine. If I could upload pictures directly to this blog, I would and show you the result.

Anyway, thanks for all the help and advice…

V/R

Patrick Demele

Sunday
6:33 am
James McNally
Australia
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Wednesday
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No problem Patrick

Glad it att worked out o.k in the end.

Like me I have not baked mine in the sun until I have let it sit for at least 4-5 hours and now never an issue

so I put mine down to the heat and there was alot of humidity that day also.

 

James

If owning a car with a nice paint job is a dream, then turn the dream into reality.
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