Limitations to use, especially in high humidity or heavy rain environments. To solve these problems, elastomerics were created. Elastomerics generally require only one coat of material in a very thin layer, applied directly over most substrates. Since they are extremely elastic, cracking is unusual. Typically, they are less expensive than ordinary stucco due to less material and less labor.
Much less material means much less weight.
But elastomerics also have serious drawbacks. Because the coat is so thin, irregularities in the substrates are very apparent in the finished product. Because the material is waterproof, any moisture which gets behind the substrate, or flows into the back of the substrate from the building interior becomes trapped, causing moisture problems in the structure. The material is much too fragile to be used as a deck covering and is delicate at sharp angles. Grail Coat overcomes the problems of both systems.