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Why wont the paint 'stick'? Painting EL fairmont grille 

 

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 Post subject: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Thu Jul 29, 2010 7:13 pm 
Tyre Shredder
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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:
Image

Grille, not fine:
Image

Stuff used:
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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Thu Jul 29, 2010 7:55 pm 
Getting Side Ways
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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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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Thu Jul 29, 2010 8:00 pm 
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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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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Thu Jul 29, 2010 8:28 pm 
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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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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Thu Jul 29, 2010 8:31 pm 
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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.

 

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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Thu Jul 29, 2010 8:32 pm 
Tyre Shredder
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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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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Fri Jul 30, 2010 9:37 am 
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thing that sucks if you have to sand it all off again......

 

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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Fri Jul 30, 2010 1:57 pm 
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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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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Thu Aug 05, 2010 10:38 pm 
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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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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Fri Aug 06, 2010 7:29 am 
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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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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Sat Aug 07, 2010 8:19 pm 
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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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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Sun Aug 08, 2010 6:27 am 
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{USERNAME} 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.... :x :evil:

 

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 Post subject: Re: Why wont the paint 'stick'? Painting EL fairmont grille
Posted: Sun Aug 08, 2010 8:18 am 
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{USERNAME} 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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