Question about proweld

i'd say not at all well.  unless we're talking about different proweld, this stuff melts plastic to bond two parts to each other.  if it doesn't get through the paint it won't actually do anything.  however, chances are it will get through the paint making a complete mess of it. 

if you really want to paint before gluing, use super-glue or something similar but that's not the best for paint either.

You can paint the parts on the sprue, but you have to scrape or sand the paint off the mating plastic surfaces. This is not a bad idea, anyway, as it can help to insure a tight seam and good bond. I usually sand all mating surfaces anyway, regardless of whether they are prepainted or not.

Thanks for the info!

By the way, do you guys know what happens when you try to glue a painted part with proweld? Is it really that messy?

It can be messy, especially if you're using enamels. Methyl ethyl kentones like Pro-Weld or Tenax 7R attack the paint AND melt the plastic.

It's inevitable that you'll have to repaint areas around seams and joints, regardless of what type of adhesive or welding agent you use.

Unless you're building a warship model, there's not much benefit in pre-spraying the major components of a model prior to assembly.

If you tell us what you're working on, maybe we can offer some assistance to make the process easier.

Regards,

Jeff

My next project I will try to get a Tamiya 75mm anti-tank gun.