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Spray paint keeps cracking..

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waterlocke22 | 15:48 Sun 16th Sep 2012 | Motoring
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My boyfriend is re spraying his plastic panels on his pit bike they've been cleaned, sanded and primed and then left to dry. Coated fine and left to dry again, then when lacquered the paint keeps cracking. However some of the other panels have cracked with just paint and no lacquer. Why is this and how can it be fixed?
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DocSausage
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As Chas says and assuming he's using a rattle can and not a gun one cause of cracking is applying the topcoat too thick in one hit which causes the film to pull itself apart as it dries

If that is the case try to build up the colour gradually with lots of light passes rather than a couple of heavy ones

Alternatively are the plastic panels flexing / being moved...
23:50 Sun 16th Sep 2012
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Avatar Image chas2008
are you using proper plastic primer ?
17:54 Sun 16th Sep 2012
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Avatar Image chas2008
im fairly sure its a product issue (somethings reacting), we paint plastic bumpers etc. all day long with no problems...
09:02 Mon 17th Sep 2012
Avatar Image waterlocke22
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It is primer meant for plastic however docSausage i think you may be right.. hes a bit, shall we say 'eager' to get it finished and i'm pretty sure hes spraying it too thick!! Thanks for your answers guys :)
12:18 Mon 17th Sep 2012
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