Powder coating over liquid

[Guest]

Have you ever heard of powder coating a clear coat over liquid paint? If so will this work on any liquid or does it have to be a high temperature liquid?

[Guest]

Re: Powder coating over liquid

It is not a problem to apply a clear coat over liquid paint, this done all the time

[wiseguyz]

Re: Powder coating over liquid

I guess that means it shouldn't hurt to powdercoat over a factory paintjob on a wheel? (providing the wheel is either new, or in like-new condition?)

[Guest]

Re: Powder coating over liquid

I guess that means it shouldn't hurt to powdercoat over a factory paintjob on a wheel? (providing the wheel is either new, or in like-new condition?)

I've always been confused by this also.

[Guest]

Re: Powder coating over liquid

please explain this more somebdy. Is this normal paint or something special. cause all my powder over paint never worked.

[Guest]

Re: Powder coating over liquid

In the manufacturing process of wheels, the process is as follows:

Primer powder electrostatic
Liquid electrostatic
Powder Acrylic electrostatic

The reason I would think that you can not get another coating to lay down properly would be that the manufacturer coating is too thick even if you pre-heat....

[Guest]

Re: Powder coating over liquid

You have to make sure that the liquid paint will hold up to powder coating temperatures. I have something on this where there is a special product that goes in between coats that is almost like a glue, which will allow this to happen everytime without any problems. Let me dig this info up and I will post it. We are actually thinking about carrying a product like this.

[Guest]

Re: Powder coating over liquid

(SNIP) I have something on this where there is a special product that goes in between coats that is almost like a glue, which will allow this to happen everytime without any problems. (SNIP)

We had a material like that in the body biz - "adhesion promoter" is what it was called.

It was very thin and clear, and was meant especially for tight spots that you couldn't sand very well like right up to masked mouldings.


Jay

[Guest]

Re: Powder coating over liquid

We supply the OEM of alloy wheels and this is how they do it... Epoxy grey powder primer... This ensures that the capillaries in the alloy casting does not cause a problem (gassing)... any imperfections can be wet & dry sanded.
2nd coat... they still use powder, however to obtain a better brightness, a waterborne aluminium is being examined (costly as the ali raw material costs >$500 but we only use a very small amount per litre). Final coat Polyester Transparent (Clear).
You can not put powder over a paint made from a varnish or alkyds as these will either burn or yellow under the baking temp of PC. This will result in loss of adhesion and the powders other properties.
However, for the refurbishment of a power coated items... instead of stripping (mechanical or chemical) some of our clients use Anoprime, a waterborne anti corrosion primer to promote inter-coat adhesion.
Terry
www.martexpaints.com