Crazed new paintwork

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Giles
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Crazed new paintwork

Post by Giles » Thu 06 Dec, 2012 3:09 pm

After two attempts to get the front guards painted both attempts have resulted in severe paint crazing.

Attempt 1 I thought may have happened due to changes in air temperature or lack of drying times between coats.

Attempt 2 I was more conscious of amount of paint and drying times and air temperature.

The crazing only appear after rubbing back which was done after 48 hours of painting with attempt 1 and 96 hours after attempt two.

Each attempt was done with a different paint batch of the same formula. The thinners and clear coat were the same. The paint formulas were the same in each batch.

Funny thing is I also painted another guard, one for my daughter car with a different paint but using the same materials on the same day as attempt 2. This achieved perfect results, well as good as I can get with acrylic paint, with no hint of crazing.

Anyone got any ideas of what may have gone wrong? I believe that there may be something astray with paint formula. The one pictured was for a 500ml mix and quantities were doubled for a 1 litre mix.
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Regards,

Giles
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1987 W126 420SEL Melb based long hauler Erwin

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eri67
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Re: Crazed new paintwork

Post by eri67 » Thu 06 Dec, 2012 4:40 pm

Giles, I'm no expert, but ive encountered this problem before, the only fix i found on the panel I had trouble with was to take it down to bare metal in the problem area, I suspect in my case the car may have been patched in enamel in the past. Good luck
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Re: Crazed new paintwork

Post by ANF » Thu 06 Dec, 2012 4:46 pm

Agree, could be a reaction to whatever was under it? Especially if you used similar elsewhere with good results.
Acrylic does not like to go over enamel.

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Giles
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Re: Crazed new paintwork

Post by Giles » Thu 06 Dec, 2012 4:57 pm

Doesn't quite nail it guys as one panel I painted green a couple of years ago and that was acrylic. Both panels had been primed a week before attempt 1 and then well rubbed back after attempt 1 before repainting. I'm not after a first class finish, just want something that doesn't resemble croc hide.
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1981 500SLC (Colour Black) Keeper car Lola
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ansteadeh
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Crazed new paintwork

Post by ansteadeh » Thu 06 Dec, 2012 5:06 pm

Giles

What about the spray/fan width on the gun and/or the amount of paint being laid down on each stroke of the gun. Too thick perhaps?

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Re: Crazed new paintwork

Post by Giles » Thu 06 Dec, 2012 6:39 pm

ansteadeh wrote:Giles

What about the spray/fan width on the gun and/or the amount of paint being laid down on each stroke of the gun. Too thick perhaps?
Possible cause is either the paint is too thick or it would the thickness of the sprayer :Doh: . I would have thought the other job have produced the same result though.

Went to the paint shop this arvo to discuss the senario and will take in a panel to measure paint thickness. I would have assumed that if paint was too thickly applied I would have had excessive runs and orange peel. Plus it may only be in certain areas if it was overcoated but its all over both panels. But what do I know? I just sell Business's and Real Estate.

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Giles
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

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Re: Crazed new paintwork

Post by ANF » Thu 06 Dec, 2012 6:54 pm

Giles,

It looks like some kind of reaction, either due to faulty paint batch (has it gone hard?) or some contaminate on the surface before you applied the top coat.
Assume that you cleaned the primer surface properly with prepsol or something equivalent?
Too think paint normally does not do that.
I think you may have to take back to bare metal now.....

Cheers

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Re: Crazed new paintwork

Post by Giles » Thu 06 Dec, 2012 7:01 pm

ANF wrote:Giles,

It looks like some kind of reaction, either due to faulty paint batch (has it gone hard?) or some contaminate on the surface before you applied the top coat.
Assume that you cleaned the primer surface properly with prepsol or something equivalent?
Too think paint normally does not do that.
I think you may have to take back to bare metal now.....

Cheers
Yep, cleaned the surface before and after priming. I reckon bare metal is where I'm heading. Looking forward to that, not likely.

The finish is like an antique distressed finish. I'll have a look to see how you create it.

Regards,

Giles
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

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Re: Crazed new paintwork

Post by eri67 » Thu 06 Dec, 2012 7:34 pm

It can be caused by too thick coats too or possibly a contamination in the mixing process??
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Giles
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Re: Crazed new paintwork

Post by Giles » Thu 06 Dec, 2012 7:54 pm

eri67 wrote:It can be caused by too thick coats too or possibly a contamination in the mixing process??
Two different batches of paint mixture, same formula, same result both times.

Attempt 2 I was very cautious of not getting paint on too thick.

At this stage I'm just glad it's only he front two guards.


Regards,

Giles
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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Re: Crazed new paintwork

Post by eri67 » Thu 06 Dec, 2012 8:19 pm

Has someone used your mixing container for something else?
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Giles
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Re: Crazed new paintwork

Post by Giles » Thu 06 Dec, 2012 8:27 pm

eri67 wrote:Has someone used your mixing container for something else?
Always used virgin mixing pots.

Regards,

Giles
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

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Re: Crazed new paintwork

Post by John Green » Thu 06 Dec, 2012 8:59 pm

My guess is that the last coat of paint was an enamal and you are getting a reaction from it...
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Giles
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Re: Crazed new paintwork

Post by Giles » Thu 06 Dec, 2012 9:21 pm

John Green wrote:My guess is that the last coat of paint was an enamal and you are getting a reaction from it...
Giles wrote:Doesn't quite nail it guys as one panel I painted green a couple of years ago and that was acrylic. Both panels had been primed a week before attempt 1 and then well rubbed back after attempt 1 before repainting. I'm not after a first class finish, just want something that doesn't resemble croc hide.
Regards,
Giles
Off to the paint retailer tomorrow with a sample panel.

Regards,

Giles
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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Giles
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Re: Crazed new paintwork

Post by Giles » Fri 07 Dec, 2012 5:34 pm

Visited the paint shop today with a sample panel. They measured for paint thickness, nothing extraordinary so they were kind enought mix a new batch made from another paint supplier and supply free of charge. Naturally I had to buy more thinners, paper, mixing pots etc but that's a fraction of what the paint costs.

Now all I have to do is rub back, prime and repaint. Should be a qualified spray painter by the time this job gets done.

Regards,

Giles
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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Re: Crazed new paintwork

Post by ANF » Fri 07 Dec, 2012 5:39 pm

Sort of good news then........

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Giles
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Re: Crazed new paintwork

Post by Giles » Fri 07 Dec, 2012 5:50 pm

ANF wrote:Sort of good news then........
Best news I've had all day.

Plus the world didn't end and I didn't have to purchase more paint.

Now I can continue on for the quest of the Holy Grail, a manual red pillar-less coupe.

Regards,

Giles
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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Crazed new paintwork

Post by ansteadeh » Fri 07 Dec, 2012 7:52 pm

Good news on the paint front. No need to try and explain the complexities to SWMBO

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Giles
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Re: Crazed new paintwork

Post by Giles » Mon 10 Dec, 2012 11:33 am

One now stripped, one to go.
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Regards,

Giles
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1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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