I've used Rejex on our motorhome for the past two seasons (applied in the spring).
The only statement about bug protection I can say is for the grill area below our windshield: They do come off pretty easily but some stains have been left. It does work pretty well as a wax in keeping the rig shiny and is opaque to UV (while its on).
Like a wax, however, it does need to be re-applied periodically (I would guess 6 months or so--we only do yearly because for 1/2 the year our unit is covered).
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