I'm not a chemist or anything like that but it does build up to form a thick coat even when buffed off. Seems that there is only so much solvent in a gob of wax, when it dries the solvent is gone and the solid particles stay in place, the next gob put on has the same amount of solvents but is now dealing with twice as much solids and so on until you get to the point where a build up starts because not all of the old solids are dissolved. JMO "> Lot of folks disagree that wax alone can form a "thick coat" if buffed off.