By TURK - 2/15/2019 3:31:41 AM
Hi guys,
I'm hoping somebody can help me with this ...................... >>
I'm currently making 2 headlight covers tooling plugs using EC' Vac-Cast Epoxy Resin. I followed the entire procedure as per the instructions, my first cast turned out superb, my second cast ( image above ) ended up with hundreds of tiny little white specks on the surface! 
The white specks are on top of my tooling plug, no white specks on the sides or bottom of the plug. As the cast was done upside-down, the top of the tooling plug would of been the bottom of my silicone mould. I used the aerosol MANN 200 silicone release on both plugs, so if the release agent would be at fault, both plugs would of ended up the same, but they didn't .............. just this one.
You can't feel the white specks when running your fingers lightly on the surface, but I'm a little concerned that they're going to cause problems on the next stage as I need to vacuum form transparent PETG or Polycarbonate to vacuum form the headlight covers.
Would anybody have any idea what caused this please?
Many thanks for your time.
TURK
T4 Concepts
|
By Warren (Staff) - 2/18/2019 1:05:59 PM
I'm surprised you need a release agent when casting epoxy into CS25. Epoxy doesn't generally stick to silicones. Maybe ditch it and retain the gloss?
The pads sound ideal.
I wouldn't use Autoglym SRP on a car let alone anything composite. It's probably fine for those who use a scratchy sponge to wash their car or parts but if you want genuine gloss then avoid it. This is because it is full of fillers. Sure they fill in scratches and make it look shiny initially but it has a very low amount of abrasion so it doesn't remove many scratches. The fillers wear off fairly quickly.
You are better off using a proper polish which will remove the scratches rather than mask them. That's generally the problem with a lot of "retail" automotive products - the people they are aimed at want quick and easy results rather than longevity. The detailing type brands and products tend to be better.
|
|