I used Durabak because it is available in 18 colors. I wanted to sort of match my interior color of tan, so I went with "sand" colored Durabak. Ordered it off E-bay to my door for $134. The "regular" colors like black, grey and I think, red are $89 as opposed to $119 for the others. You get 1 gallon and a special roller to apply it, which I cut into 3 pieces and used a trim roller from Home Depot, because you need a different roller for each coat because that stuff IS NOT coming off of whatever it gets on! I gallon gave me 2 coats which I think will be sufficient, but I would like to get another gallon just to make it super thick. Even if you got 2 gallons it would still be waaaaay cheaper than Rhino @ $800(around here!).