By crooky - 2/3/2014 6:30:12 PM
Hi, apologies if this is in the wrong section.
I am looking to cast a polyurethane/polyester piece with a finish similar to this http://www.intertronics.co.uk/products/opt4220.htm.
The finish will be from 2-3mm thick and needs to be able to allow small LED's underneath the sheet to be seen from the other side.
As I am new to the world of casting, I'd like to ask if this finish is possible from just using a small amount of white colour pigment, or if I need to use a different kind of additive to the resin before casting.
Thank you.
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By Warren (Staff) - 2/4/2014 5:02:07 PM
You would need to experiment with the amounts of pigment to achieve the level of translucency that you desire. From our experience you need around 5-10% to make the resin pretty much opaque to most light, so you would be looking below that level for your objectives.
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