Which type of poly did you use? I have experimented with a couple different types but never found anything that looked durable enough to use for mounts. I have a couple things I would like to recast.
I used Simple Resin's Enduro-Flex product for my axle mount pivots. It looks like it's back available, as it hasn't been for a while.
LinkIt can be tinted if you want. Their tech department sent me this info:
Add pigment at ~2% of the total mixture to the Part B side and blend. Make sure its not a water based pigment.
Combine colored hardener and resin at equal weights or volumes.
Mix well for 20-30 seconds scrapping sides and bottom of mix container several times throughout mixing process.
Pour into cavity.