I'm in Hawaii [heavy UV] with a concrete shake-style tile roof.
If you are simply adding a color coat to even out the look, skip the heavy
prep.
1/3 the work and 1/3 the price.
I've had fine results from simply applying a quality elastomeric coating
with a heavy nap roller.
Don't apply after a rain - you'll tend to get bubbles. [Of course, no
better way to get a drizzle than to start a roof project.]
Colors will fade in a few years [darker colors faster] but the results
should be uniform.



--
Remove -NOSPAM- to contact me.