hiya Grant,...with painting roof tiles, it all depends on what reason you wanted to paint them for,....if it's such as just decorative, then there are plenty of home owners out there that have done this and i must say it does make an improvement to the way a property can look especially if the rest of the exterior of the house is in good decorative order, normally the roof tiles get overlooked.
but then again, how many people stand there looking at their roof,...not many i must say,...that is unless it is leaking.
If you would like to disuss this matter a little more then please send me an e-mail to [email protected] and i will be happy to assist you, Paul