Plastic Prep.

[sIIgtst]

HI All

im about to spray my series 1 rear garnish the same colour as my car.. so my question is

what do you all recomend to do to prep the garnish before spraying the primer, do i just use some kero to clean off all the oil and grease or do i

need to sand it back with some wet n dry paper to roughen up the surface a little bit???

Cheers,

Corey

[FineLine]

HI All

im about to spray my series 1 rear garnish the same colour as my car.. so my question is

what do you all recomend to do to prep the garnish before spraying the primer, do i just use some kero to clean off all the oil and grease or do i

need to sand it back with some wet n dry paper to roughen up the surface a little bit???

Cheers,

Corey

Dont use kero. It will leave an oil residue and the paint wont adhere properly.

I give mine a fine sand with wet and dry, Clean it off with prepsol, then use a plastic primer (available from super cheap in pressure pak cans) then paint it and finally clear coat it.

This system works well and even under the bonnet using non heat proof paints it has stuck well and looks good.

[DECIM8]

As above however use a 2000grit on the plastic primer this will give a smooth finish and let the paint above look as good as your body paint (sand back every layer except the last - with water)

Fyi i dont use plastic primer

[sIIgtst]

Cheers for the info..

much appreciated.

EDIT: why dont you use plastic primer decim8??

Cheers

Corey

Edited June 3, 2008 by sIIgtst

[DECIM8]

I only use it on black, plastic primer IMO doesnt seem to make it stick any better IMO its what causes the paint to bubble under heat when its closed in a car.. The spray paint can is prob not as good as the 2pak gear pros use.

It gives you a better base coat so black looks better, it also allows you to sand it back so everything is damn smooth so it becomes glassy and shiny but 3 months mine bubbled, twice. last one has not bubbled.

[Trav33]

If you cant find Prepsol, its also called "Wax and Grease Remover", supercheap sell it in aerosol cans and in a big 4L bottle too.

[mark_sudakov]

Any idea wat causes small cracks in the clear coat of the paint? Too much thinner in the acrylic paint?

[DECIM8]

Out of a can? Or spray job? Yes if its a spray job.

Could be a range of things for eg a Knock can cause it.. But if it hasnt been knocked..

Heat - ussually yellows with this tho.

Oil/residue not cleaned off correctly.

Thinner or cleaner splashed onto paint either before or after.

But mainly its due to not corretly premixing the paint, heating the paint in hot water two minutes before will help the mix especially in colder weather (this is of course in spray cans)

[mark_sudakov]

Out of a can? Or spray job? Yes if its a spray job.

Could be a range of things for eg a Knock can cause it.. But if it hasnt been knocked..

Heat - ussually yellows with this tho.

Oil/residue not cleaned off correctly.

Thinner or cleaner splashed onto paint either before or after.

But mainly its due to not corretly premixing the paint, heating the paint in hot water two minutes before will help the mix especially in colder weather (this is of course in spray cans)

yes it was premixing acrylic paint with thinner (1 paint:2 thinner - for clear coat), then spraying with gravity fed gun. The thing is it only happens in some areas and appears to be the top layer(clear coat). I mix it by pouring paint and thinner in a bottle, then shaking it to mix for a good minute

[DECIM8]

No idea why then ...