Brushing this on does not ensure that the coat will be uniform, it is easier to have a greater amount so that the thin areas are not so thin that they don't peel off.
While I use the Latex type material now, I used some of the modeling types for R/C car bodies, and found that the thin, light coat did not remove from the body and had to be scrubbed, but thicker coats were able to peel right off.
Also the latex I use can be used to mold small parts such as carbs, a few coats, a layer of gauze then a few more coats, I can pour resin in it and have a duplicate.