My tarp tent SCARP 2 and Moment DW have well coated silnylon floors but I like to coat them (on the outside) with another coat of silicone for reducing wear and increasing waterproofing.
I mix the following: (by volume)
1 part clear GE Silicone II caulk
5 parts “odorless” mineral spirits
PROCEDURE -> (1.) mix ingredients in well-sealed jar by shaking vigorously  (2.) pour about 1/2 cup into a SMALL paint roller tray  (3.) using a low knapp, narrow roller (fits the small tray) roll coating on a 2′ x 2′ area of the floor  (4.) immediately wipe lightly with a blue shop towel (to keep from contaminating coating with paper fibers, as a regular paper towel would do). (5.) shake sealed jar well every time before refilling small paint tray
Continue this procedure, overlapping along edges of finished areas. Coat floor “walls” as well.
Yes, this may add an ounce or two but it’s well worth it for floor longevity and peace of mind when rain begins to run under your tent floor. (Hey, you know it happens.)
