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| thepistonhead |
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I'm painting my EL grille and my chrome number paint surround heritage green to suit my car.
The number plate was fine, but the grille turned out rubbish and i have no idea why. For both of them i sanded the surface, wiped it thoroughly then applied three coats of the primer in the picture. As soon as the paint hit the grille to spots 'formed' on the surface. I also have put on one coat of the clear coat on both.. assuming i'll have to sand it off when i'm trying it again? What can i do, and why has it happened? I have painted many plastics before and not come across this problem. Plate surround which was fine:  Grille, not fine:  Stuff used: 
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| Johnny C |
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are you using all the same cans from the first batch of painting you did?
Definately looks to be a contaminated surface onto which you are trying to paint. Tried shake up the heritage green can a bit more? |
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| dsyfer |
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Looks like it has had wax or silicone on it at some stage, I would say you will need to sand it back, then give it a good going over with silicon-off or a good wax and grease remover then try again.
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| AU99 |
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If there is wax or silicon on the surface it wont stick and cause exactly what has occurred....
Clean off with a wax/grease remover after sanding. Make sure you shake the cans for a few minutes prior to painting. Best to spray a few light coats of primer, let that dry for at least 1 hour if warm weather. Give a light sand with 600 wet & dry and allow to dry. When applying colour do the same, apply several light coats, same with the clear coat if used and allow a day to dry before putting back on the car......
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| KWIKXR |
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I agree with the above posts, looks like there is something on the surface preventing the paint from adhering properly, I've had similar things happen with a few plastic things I've sprayed before. Sand it back and go over it real well with wax and grease remover, let it air dry for a bit, then spray on a few very light mist coats and see if you still get those problems.
Last edited by KWIKXR on Thu Jul 29, 2010 8:32 pm, edited 1 time in total. |
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| thepistonhead |
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Ahh yeah, wax seems likely. Haven't owned it for all it's life so that's probably likely!
Thanks a lot guys.. off to the basement i go!
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| AU99 |
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thing that sucks if you have to sand it all off again......
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| el fantasy |
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try painting another layer once its dried, then another one...if that doesn't fix it, sand the hell out of it then paint again.
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| EFFII |
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rub it back...clean with wax and grease remover then apply a medium coat to start with...the wetter you put the paint the more chance silicon will re appear..
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| Deff |
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Yeh wax/grease remover before paint mate.
It's called fisheyes, basically only needs 1 small grain of silicon to do each 'eye' |
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| thepistonhead |
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Yeah cheers guys, got it all good now.
Will add some pictures once i find my tube spanner and put it back onto my car!
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| OZBMX |
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Deff wrote: Yeh wax/grease remover before paint mate. It's called fisheyes, basically only needs 1 small grain of silicon to do each 'eye' fond memories....  
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| hans hartman |
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thepistonhead wrote: Yeah cheers guys, got it all good now. Will add some pictures once i find my tube spanner and put it back onto my car! there is a 3rd way around heavy silicone contamination,as you sand it still spreads and many wipes with prepsol,reduces it.use a alcohol based isolator coat to seal it and lock it up,then use u-coat and fill.DONT break that seal coat.car repairs and car yards try to match panels and use all types of polishes to sell the cars.
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