Originally Posted by
Mustardman
It's a silnylon stuff sack, so any silicone sealer will work. You can either buy a tube of silicone seam sealer, or mix some pure silicone caulk and mineral spirits to make your own. With mine, I ended up removing pieces of the seam tape and sealing underneath them. I've never liked seam tape, and vastly prefer gooping on some sealant.
Assuming you're still using the MEC Sil 9x7 tarp, the same sealer will work on that. If it's a different material, you might need to use a different sealer.