What are the coverages on different substrates for AIR-SHIELD LMP?

It varies on every substrate. On the data sheet, we list the coverage for gypsum sheathing which would be pretty consistent for smooth substrates. On rougher substrates, such as CMU, that can vary due to the densities of the blocks, surface profile, and porosity. It is difficult to give an exact number which is why the testing of the wet mil thickness is more important than relying on a coverage rate.