Never Wet

Roof mfgs don't recommend anything be used on their roofs including protectants, etc.

Thanks everyone, I was just reading about some of it's uses, and it started my curious mind.

I always go to Amazon.com and look up products like this. After reading the comments I will not be using it on anything I own.

My thinking the less I mess with my rubber roof the better. If you clean them so they are nice and white you have removed some of the roof material to get it that way.

how much does it cost?

don't know exactly why you want to apply it but if it is for mold prevention I kept having to chlorox my cedar siding and my neighbor recommended wet and forget which he got at Sam's or costco. took mold off with chlorox, then sprayed W&F. worked great, just spray it every six months-year and no more mold. don't know if it will eat up EPDM however.
much easier/cheaper than the referenced product.
bumpy

I think the big question would be, how long will it last on the roof?

If it lasted a couple years I think it may be worth the expense.

I have read some reviews that it needs to be reapplied frequently, but that was about a year ago. Maybe it's improved and will last longer.

It does seem like a good idea.