Okay so I have enough stuff prototyped up to justify the hateful act of resin casting. I hate resin casting, but strangely I end up molding up roughly 80% of everthing I touch. I guess I'm paranoid about wanting to do something twice and having to make two scratch-builts. I dunno.
Anyway, here's a quickie on how its done.
I lay out the parts on a flat surface and build a box around them. Usually I jam-pack a mold box with stuff, but in this case I wanted to use a box I already had and I didn't have that many things to cast.
BTW, the twelve little intake trumpets there are for a Porsche 917/20 "Pink Pig" project I'm doing for my daughter.
I use GI-1000 RTV silicone. It's a two-part deal. It's not the best, but it's not too expensive and it's easy to use.
It's important to stir/mix both constituents. Lots of people don't do this and end up with 'soft' molds.
Another important issue is to get the ratio more or less exactly right. It's 10:1 by weight and any big-time deviations will come back to haunt you. I use a good quality postal scale for measuring.
Also, good ventilation is a must. The vapors from this crap are known to be neurotoxins. I mix in front of the window and run my fan at full blast.
then, after a thorough shaking, I weigh in the catalyst.
