I have looked at a few different coatings such as Blackjack and wondered if anyone had any suggestions or experiences with different roof coatings?

Just my two cents based on my 20 years experience in the field of forecasting and money management (I was also a semi-professional Black Jack gambler).God Bless You.

I compare it to playing blackjack.  

Depending on what kind of sealant you already have in place makes a difference, but last time I looked Walmart ( or any big box store) had  both black jack ( I LOVE THAT STUFF EVEN IF IT IS A COMPLETE MESS) or the white elastic stuff in 5 gallon buckets for like 75.00 to 100.00.

As Charles sort of suggested, there's probably some sort of economics-based differential equations that could be used to model return vs risk vs time in various investment activities.While it probably wouldn't be useful in real life (not sure you could tune the inputs well-enough to be meaningful), you could probably play around with various inputs to get a feeling for their sensitivities to one another.If I were smarter, I'd probably be able to apply some of the utility modeling work I used to do as a poker player to real estate investing...Which actually reminds me that I've been meaning to start a really geek thread on a related subject...a bit off the topic (or maybe not), but if you've studied card counting in blackjack or were ever a geek poker player, you may be familiar with the Kelly Criterion...I've recently started thinking about whether there is a way to apply the concept to portfolio real estate investing:http://en.wikipedia.org/wiki/Kelly_criterion

I used to have a Blackjack and it was actually a very good phone!

The answer was to lower expectations to reality or play 10 perfect hands in a row of blackjack or 10 perfect futures contracts in the market. 

Such as blackjack if you're counting cards.

Blackjack may have a 99% payback.

You MAY someday be able to refinance this for a lower rate, but if the success of the investment depends on that it is akin to the blackjack table.2.