I am building my own home and workshop. I am building it out of an ICF product called Rastra. This is a styrofoam pellet and concrete mix poured into giant blocks.

http://www.rastra.com/

The home and the shop are built into hillsides and so some of the walls will be below grade. Although they are in the desert southwest, I have chosen to apply waterproofing. I figure it is cheaper to do now than wish I had later. Ground moister content is non-existant, but we do get some tremendous downpours at times.

I found a new barrel of Eco-Flex liquid rubberized waterproofing. It was surplus and cheap. http://www.aquasealusa.com/eco-flex.htm\

Since this is a one-time deal, I planned to roll the product on. I had read some other blogs and this was an effective method for others. However, the surface texture of the Rastra is so rough compared to poured concrete or a CMU block that getting coverage in all the recesses has turned the job into a much bigger task than anticipated.

The blogs also discuss some folks spraying it on. However, they indicate it requires a "big" spray system. Not one of the $199 sale items at Home Depot or Lowes. The blogs also indicate that you should NOT get a rental unit because you cannot get it clean enough afterwards. After using the roller this past weekend, I can believe that! So once you commit a spray unit to the cause, it is pretty much dedicated.

I have seen several used paint sprayers on Craigslist. If the unit is cheap enough I can justify "ruining" it for the cause. It could even have some issues as long as it functioned.

My question for this discussion is what do people consider the minimum sprayer to use on a product like this. I am looking for brand and model suggestions since I know nothing about sprayer specifics. The blogger that sprayed this stuff for a living had a dedicated Graco Mark V.

A second long shot question: anyone know somebody in the Phoenix, AZ area that has a sprayer already used with this type of stuff that would hire it out?

Thanks in advance.

-dc