Well, the two on the left have some air bubbles ´cause they were for testing out where the \"problem spots\" of the molds are - don´t know if you want THESE....
Right now I´ve been experimenting with white paint and the resin does almost look like like plain polystyrene now, less translucent.
For the gear parts I have added aluminium powder to make the stuff harder, I put one of the models on wheels and try if they are strong enough. I think it works unless you point a hairdryer at full heat right on the landing gear.
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How about placing brass or steel rods in the mold cavities, prior to pouring? The resin should flow around the rod and make for stronger pieces.