T-rex resin

Just received a set of bump stops for my pz.beob J,the instructions say to prime parts before you attach to the model think it’s about exposure to light, surely the resin has hardened enough and won’t damage them if I don’t.
First time using 3D printed parts.

From my experience with T-Rex, their parts are somewhat flexible, which helps a lot removing them from the tree without breaking them. I understand that if they are exposed to light they will be completely cured and therefore, more rigid and fragile. Primer prevents the light to cure the resin.

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Thanks for your reply.
I will give them a shot of Tamiya primer.