The colour of the domes "I think" doesnt bother anyone.It was more of a statement in the sense of lubing the domes up to prevent cracking or drying out,so the hair dryer treatment is not for me and "I think" that people would not want to apply that approach.
There was a guy who posted here before , he stated he had put armorall on the domes....But this is also a sealer and I would not reccomend that either...As long as they are not cracked and are still soft and pliable your fine!!