Newbie- Painting fiberglass plug / mold for forming styrene?

[RFC]

Hello,
I am as green as grass when it comes to plastic forming. BUT, I have lots of enthusiasm and am eager to learn.
I would like to home produce / thermoform .020" flock covered styrene to make display case liners that are about 8" x 12" and 1" thick.
Using a sample liner that I wanted to duplicate, I made my first plug ( terminology?) by layering the inside back with Tiger hair fiberglass.
Removed the plug and now filling the voids and air pockets with glazing putty.
What I would like to know is after the plug is filled and sanded, can I paint with lacquer primer progressively sanding with finer grit paper
to achieve a semi glossy surface?
Would the last step be to wax the plug before using? Will lacquer stand up to the heat of styrene forming?
Thank you for your help, Bob

[trophy]

I would fill the tiger stuff with more bog or better still a polyester resin thickened with talc and trowel on.
The resin talc mix will sand down to a very smooth surface.
As you are flocking the part I would have thought it does not need to be that good a surface.
You will be able to vac over the polyester talc surface without further treatment.

[J&M Enterprises]

Originally Posted by RFC Hello, I am as green as grass when it comes to plastic forming. BUT, I have lots of enthusiasm and am eager to learn. I would like to home produce / thermoform .020" flock covered styrene to make display case liners that are about 8" x 12" and 1" thick. Using a sample liner that I wanted to duplicate, I made my first plug ( terminology?) by layering the inside back with Tiger hair fiberglass. Removed the plug and now filling the voids and air pockets with glazing putty. What I would like to know is after the plug is filled and sanded, can I paint with lacquer primer progressively sanding with finer grit paper to achieve a semi glossy surface? Would the last step be to wax the plug before using? Will lacquer stand up to the heat of styrene forming? Thank you for your help, Bob

I can't comment for sure on the lacquer, but I can tell you what we use. For starters, I would use a high-temp bondo to smooth everything. You can then paint it with an all-purpose primer (google "fourseal") or a higher-temp product, like Duratech.