Gear Aid SilNet Silicone Seam Sealer is specially formulated for sealing seams on tents and other outdoor products constructed or coated with silicone, such as silicone treated nylon. SilNet may also be used as an in-field repair material for moderate rips, tears and areas of abrasion. When applied to seams it will 'self-level' creating a smooth sealed seam. Sil Net is the best product to use to create good looking sealed seams on sil nylon tents, tarps and other items. Sil Net has only modest repair adhesive qualities (OK for pinholes). Sil Net won't bond properly to non-siliconized fabrics.
This is a good silicone sealer, if doing a tent (I did a 4 person) you will need 2 of these tubes.