No cracks - maybe because I've used the Low - Gloss Grey Label Armorall (not so easy to find anymore) on all my plastic a few times, but in the interim it would seem the black Permatex High Heat Silicone (comes in an orange tube) would fill in the crack without notice - it is also a low shine silicone filler & I've used it on firewalls around wires many times.
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