I have repaired those. These cracks are not deep. They are in the "sealed" coat or some may use the term "gel coat" but its not a glass bumper strip. Looks like yours is on the inside?
To fix it, you'll need to blast it with plastic and get it down to the more rubber type body. Once you do that, use SPI EPOXY PRIMER ONLY. prep surface with waterborne, then solvent based cleaners and follow the free directions they send or use their forums.
You MUST wait 30 min Plus ( I use 1 hour) or up to 4 hours of Induction time ( mixed and awaiting being sprayed) the longer the paint is Inducted, the more UV protection it has.
Put on primer, wait 30 min( use a timer, don't guess) and put on 4 coats.
Wait a day and start to block it with 220. This primer sands well and REMAINS flexible. You can apply a "bumper" black type paint on top of the primer.
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