Don't do it with a good blade!
We were in a hurry to get the paint room drying rack put together so I didn't do any research before cutting 48 fiberglass rods 3/8" thick in half. A few hours later I attempted to cut some soft maple window sills to length. Burn burn burn. Now I'm forced to use a cheap Dewalt blade I've had on the shelf for 3 years that came with my CSMS while it's out for sharpening.
PSA - Use an old blade or a metal chop saw to cut fiberglass rods