Well Justin, as an installer, I read product data sheets and installation guidelines. Then I have to figure out how much material and correct tooling I need for any particular project. For instance, If I have 1200 sqft and a particular kit spreads at 60 sqft with a 1/2 inch squeegee, I know Ill need to have a minimum of 20 kits on hand (I always have a few more just in case). Knowing proper spread rates not only helps me order correctly but also helps me know it's being applying correctly as well. As you know, some products will not perform properly if it's applied too thick or too thin, such as polyurethanes, which if applied too thick can blister and turn brittle. So knowing proper tooling, application method and spread rate is much more concerning to me. Other than that it's useless to me. So tell me Justin, where does knowing mil thickness help me?