There is retro reflective spray that can be purchased,
Link here, I would be careful utilizing this though because it does not consist of fibers, etc. and there is a rule prohibiting the deposit of lubricants and other such materials on the field (R09) (a bit of a stretch, but something to consider.) Additionally, for any retro-reflective case, R07-C may also come into play if you are not using this specifically for your use.
Regards,
Skye Leake