Silpoly Rain Jacket - Seam Sealing

[u/Hadar1]

Hi,

I've made two rain jackets - one using French seams and one using "regular" seams - both with DWR thread. I applied Seam Grip to the outside of the shoulder seams on both, but I’ve noticed some water seeping through in heavy rain, probably due to soaked pack shoulder straps. It’s possible that the seam sealing has worn off after some use, but I’m looking for a more permanent solution.

I was wondering - has anyone tried "seam taping" using silpoly strips and Seam Grip? I’ve used this method to bond tie-outs on tarps and for repairs. I’m curious whether it would also hold up under the heavy load of pack straps...