DIY silver coating
First I would recommend finding out exactly what product you have on your roof. If a true "rubber" roof, like EPDM, they are not very tolerant to many solvent based or VOC products and can actually do more harm than good. Like eating away at the rubber. If you do have an EPDM roof, you need to make sure you are using a product that is compatible with it like an elastomeric coating. Check the label to make sure it is safe for use with EPDM. A primer may be recommended.
Some lay people may refer to a Modified Bitumen as a "rubber" roof. It has platicizers in it but can stand up to using an aluminum coating but it is not the same as an EPDM.
A true EPDM sheet can cover a large area with one sheet (similar to a pond liner) whereas with a modified roll, you would see seams where each roll overlaps.
As far as complexity, it's a roll on product that you would use the same equipment to paint a wall. Not difficult if you enjoy painting. Just be careful of where you're going so as not to misstep off the roof. Put a safety barrier around the perimeter of the roof.
You might want to look for a suitable product at a roofing material distributor where they cater to the professional trade rather than a Home Depot or Lowe's. I know in my area rubber isn't that popular on residential roofs, so I would make sure that I got the proper quality product. Although I see from this site rubber is more widely used.
Last edited by Horseygirl; 10-09-2011 at 08:19 PM.