Sealant failure is one of the top causes of containment barrier failure. Spend time to pick products that work, and don' make this a victim of value engineering. If you have a really industrial-grade wall sealing problem, consider 90-mil thick flexible coatings from Stonehard of Sherwin-Williams. Expensive, but proven.

- From Tradeline's 2005 International Conference on Biocontainment Facilities