Sorry for the delay in replying. To answer your question, yes I did seal the inside of the seams with the Seam Grip. Now that I’ve just finished another boat (UL), I believe I made two mistakes on the Skeena: not consistent with my linger time when welding, not using a good enough bowl/jig to shape the seams at either end. Lessons learnt. Not had a single leak on the UL and I did not seal the seams with Seam Grip.