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Discussion Starter · #1 ·
A few weeks ago I did 2 new rear wings & the old boot with no problems. Today disaster, sprayed the 2 new wings ok with etch primer 2k but the old doors have reacted. Is it the old paint? Have I gotta remove all the paint back to bare metal? If so What's the best way to remove it? Orbital sander 60 grit ok?
 

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Does look like a reaction to the paint underneath, either get the new paint off and smooth and use a sealer, or get it all off down to metal, orbital would be faster. 60 grit is a bit harsh might damage edges.
 

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See the problem is with bare metal is you would have to remove all filler and paint there may be on there if you leave the filler on as ive found to my cost the new stuff will react in circles round the filler

was it etch primer you used ? old etch primer and new etch primer dont get on
 

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Discussion Starter · #9 ·
No I didn't use any barcoat, it didn't react on the filler/bare metal area. Spoke to guy whose gonna be painting it & he said strip it off with paint stripper back to bare metal
 

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yeah but this is what this stuff is designed for
do main prep then cover with bar coat then 3/4 coats of filler primer and as long as you don't go through the primer then all will be good
 

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Get rid of the offending layer, you don't want an unstable layer in there even if it's temporarily sealed with Barcoat. Old paints like this continue to move move over time with heat etc.
 

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Like Grumpy Grandad says. A while ago ,early 9os, there was a paint product that was a cheap 2 pack. It was one pack poly (cheap shiny paint) and the powers that be
made it in to a 2 pack. Leyland and jaguar used it for a while.

Anyway it was crap especially if you came to paint over it. It never really went hard and when flatted it was just like synthetic.

This information is based on an actual experience not a search on Google!!

DC
 

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Discussion Starter · #15 ·
Anyone recommend a good paint stripper? Last time I used some it would sting if you got any on bare skin but this stuff don't. What grade should I finish on bare steel? 80 or 180?
 

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