"In my opinion" Herculiner tends to be rough textured and the color fades within a few months. Monstaliner and Durabak are a better alternative if you want a D-I-Y product. Both products have smother texture, UV stable, and stick to the surface better when properly prepped. I've used all 3 products multiple times and I tend to like Monstaliner the best.
Here is some additional information: http://www.monstaliner.com/monstaliner_comparisons.htm