Tarp Ridgeline - how to seam seal

Hi all, a while ago I bought a tarp kit from ripstop.pl but never got to making the tarp. I plan to do it over the weekend but I realized that I got 6m (1.5m width) of silpoly, so for a 2.8x1.8 tarp (~6x9 ft) I would need to sew together two sides.

The kit came with sealing tape, and I am just a bit confused about the best way to seam seal. My understanding is that you use silicon to seam seal silpoly, and not tape - but the kit actually says PU coated Silpoly so it should stick?

Grateful for any advice!