1.5 oz tube of the good stuff. No mixing, just punch the top and squeeze a bead on the ridge-line seem of your tarp. Just the right amount to cover one tarp per tube with a little left over to do any touch-up spots once the first coat dries. SilNet Seam Sealer is the only sealer that Arrowhead Equipment recommends and uses in house for all of our tarps. It has the right consistency to spread easily and if used on a flat surface will self level to even out any high points or brush marks.