I've heard there is a paint on the market that is suppose to simulate stone (for exterior purposes). Do you know the name and where I could find it?

Second question: I'll need to get up on my roof to paint a section of my house. The roof is steep. What is the best method to use for support?

Thanks

Don't know the answer to your first question. Hopefully someone else can answer.
As for the second question, you'll need roof kickers. These are metal supports that get nailed to the roof then a 2x4 or 2x6 is used to span between them. Easiest way is to nail them through the shingles then patch the holes w/ roof tar when done.

Get a harness and rope
No holes and easier to deal with

The paint you may be referring to is available at www.stonlux.co.uk