Rep Power: 337

I made a custom piece for two din units with about a quarter inch between them. its made from 1/4 abs plasic, I then used hot stuff glue and activator to hold it in and filled the seam with mar-glass. i sanded away at it untill all smooth and used duratech primer. now the problem is random cracking and either the piece is shrinking or the primer is expanding because the motorized face will now not open like it did the day after i primered it. Im in AZ and its about 110 outside so incar has to be at least 150 and its in the dash so direct sunlight. is there a way to avoid this? thinner coats of primer with incar time to cure maybe? any ideas?

 
Rep Power: 337

i unfortunately dont have the anser you want, but i had the exact same problem. the filler expecially i used did not hold paint, cracked all over the place.

i solved the problem by laying up carbon fiber over the whole thing.

my suggestion would be o try laying up some real thing weave fiberglass over it, and repainting the now uniform surface.

not uniform form sanding, but uniformly one solid piece of fiberglass, no matter how thin....

 
Rep Power: 337

ya.its cracking all over the place. places where its marglass, places where its just scuffed plastic (by the hazard switch) and its not along the parts i glassed either..one crack is diaganol...damn it...more sanding.