I would suggest you use CA glue or Super glue. The epoxy would also work but might melt the plastic. The silicone will take longer for the vapors to wear off or bleed off, not sure what the higher heat might do also. I do know the higher heat will not affect either the CA glue or the 5 minute epoxy after it cures for 48 hours or so.
Depending on how large the cracks are use either medium or thick CA glue. Depending where the cracks are you might also consider making repairs using plexi-glass to reinforce
the worse areas. You can cut it with a jigsaw or hacksaw and heat it in the oven at about 225 degrees and it will be mold able not sure how long but with 3/8 inch thick, it should be about 1 -2 hours or less. Good Luck.
Depending on how large the cracks are use either medium or thick CA glue. Depending where the cracks are you might also consider making repairs using plexi-glass to reinforce
the worse areas. You can cut it with a jigsaw or hacksaw and heat it in the oven at about 225 degrees and it will be mold able not sure how long but with 3/8 inch thick, it should be about 1 -2 hours or less. Good Luck.