I want to make a jig which sits on my de-molded parts and provides a fence for my trim tool. Which trim tool should I base it off of? I have a rotozip and a router. I am leaning toward the router because it has more power and a wider range of bits. Which tool should I use and which type of bit?
Should I use an air tool for longevity (abrasive dust)? if so which tool? I have much trimming to do!
AMAC
Always use air tools when trimming or drilling composites. For drilling, one can get away with electric tools for a while, but they’ll ultimately wear out from the dust.
The trim fixture should be pretty much the same as your mold, but cut undersized by the radius of the router base minus the radius of the bit. This will only be worth the trouble for something that is produced in significant quantities.
bits should be of carbide or diamond coated, not bladed like a standard router bit. You can use any bit, but you run the risk of both dulling it out quickly, and fraying of the edges. Do a test once you have your jig set up, and if you think you need the diamond coated, go for it.
Just my 2c, depending on what you will be using the parts for (and what other addition to the part will be made) you should NOT oil your air tools, this is to prevent contaminating your layups (or part). Buy cheap tools… and when the go south buy new ones.
The best cured fiberglass cutter out their if by far the fein tool… The cutting blade can last an entire aircraft project 
Great input, thanks
Great input all, thanks!