A small 7-gram tube of Seam Sealer from Warbonnet Outdoors.
Warbonnet Outdoors tarps' ridgeseam, with black binding (built-in ridgeline), will shed water without the need for a sealer as long as this seam is always the highest point.
This tube is for panel pulls but could be used in other areas.
Apply silicone to the 4 V-shaped patches on the underside of the tarp. Apply to the stitch pattern only. Force the silicone into the needle holes and sewing thread by applying it with hard finger pressure. Hang until dry (6-8 hours).