Russell
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| posted on 18/4/10 at 05:54 PM |
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Help with paint problems please (what a mess!)
I've just sprayed grey primer on my gearbox and it's done this:
Image deleted by owner
What's going on? I'd previously comprehensively cleaned and degreased every nook and cranny of the gearbox then hand painted it using
"special metals" (including aluminium) primer, which went on with no problems at all. That primer has had 6 days to dry.
I decided to give it a blow over in grey primer ready for a silver top coat since the ali primer is a sort of desert sand colour - you can see it all
yellowy where the paint has crinkled.
Please, can anyone tell me what's causing this and give me any tips to prevent it happening in future?
I'm a bilingual illiterate. I can't read in two languages.
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Airhead
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| posted on 18/4/10 at 05:57 PM |
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That looks like a reaction between the two primers?
Anybody?
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boggle
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| posted on 18/4/10 at 06:02 PM |
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did you not want a crinkle effect??
just because you are a character, doesnt mean you have character....
for all your bespoke parts, ali welding, waterjet, laser, folding, turning, milling, composite work, spraying, anodising and cad drawing....
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gingerprince
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| posted on 18/4/10 at 06:05 PM |
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Looks like this
 
Rescued attachment 090_024.jpg
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MakeEverything
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| posted on 18/4/10 at 06:07 PM |
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quote:
Originally posted by boggle
did you not want a crinkle effect??
Like Boggles skin?
I had this problem ona fuel tank. The sand colour primer was primer filler was it?
The only way to get around this now, is to get rid of all the paint and start from scratch, making sure the paints are compatible.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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Russell
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| posted on 18/4/10 at 06:08 PM |
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Nope, I definitely didn't want a crinkle effect  . Maybe I could get away with a crinkly gearbox but it hasn't happened all over, just
in patches. The photo above shows the worst bit.
I'm a bilingual illiterate. I can't read in two languages.
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Russell
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| posted on 18/4/10 at 06:10 PM |
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quote:
Originally posted by MakeEverything
quote:
Originally posted by boggle
did you not want a crinkle effect??
Like Boggles skin?
I had this problem ona fuel tank. The sand colour primer was primer filler was it?
The only way to get around this now, is to get rid of all the paint and start from scratch, making sure the paints are compatible.
No, it wasn't primer filler, just regular brush on ali primer
I'm a bilingual illiterate. I can't read in two languages.
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MakeEverything
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| posted on 18/4/10 at 06:15 PM |
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quote:
Originally posted by Russell
quote:
Originally posted by MakeEverything
quote:
Originally posted by boggle
did you not want a crinkle effect??
Like Boggles skin?
I had this problem ona fuel tank. The sand colour primer was primer filler was it?
The only way to get around this now, is to get rid of all the paint and start from scratch, making sure the paints are compatible.
No, it wasn't primer filler, just regular brush on ali primer
ok, sounds like a similar problem to the one i had though.
Try rubbing off, and spray the whole lot over with a tin of normal white primer.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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Ben_Copeland
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| posted on 18/4/10 at 06:35 PM |
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Yep definately reaction between the two paints. I'd just leave it as you probably won't see it anyway
Ben
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prawnabie
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| posted on 18/4/10 at 07:01 PM |
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I take it the first primer was a hammerite product?
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Russell
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| posted on 18/4/10 at 07:02 PM |
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quote:
Originally posted by prawnabie
I take it the first primer was a hammerite product?
No, it was a Blackfriars one.
I'm a bilingual illiterate. I can't read in two languages.
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Fozzie
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| posted on 18/4/10 at 07:04 PM |
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Another vote for dissimilar 'paints'....
Fozzie
'Racing is Life!...anything before or after is just waiting'....Steve McQueen
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Litemoth
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| posted on 18/4/10 at 07:16 PM |
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You've put a cellulose based primer over an oil based one by the looks of things.
Same happens with dissimilar top coat/primer combinations. Try mixing a tiny bit of each together before you paint. If they 'curdle' then
avoid overpainting
Easy to be wise afterwards of course....
Gutting
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Russell
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| posted on 18/4/10 at 07:28 PM |
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quote:
Originally posted by Litemoth
You've put a cellulose based primer over an oil based one by the looks of things.
Same happens with dissimilar top coat/primer combinations. Try mixing a tiny bit of each together before you paint. If they 'curdle' then
avoid overpainting
Easy to be wise afterwards of course....
Gutting
Gutting indeed!!! It's going to take an age to sort out that mess. It's an Audi transaxle that's going in a middy so the gearbox
will be highly visible when the rear engine cover is lifted and I want it to look tidy. I can't just leave it.
Thanks for the useful tip about "curdling".
I'm a bilingual illiterate. I can't read in two languages.
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Mark Allanson
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| posted on 18/4/10 at 10:05 PM |
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Its when you overcoat one paint with another when the lasts coats thinner is more aggressive than the first. eg You can coat celly with synthetic but
not vice versa
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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