Seam Seal Spray on Backpack Seams?

[Patrick W]

With the help of many of you I have completed my first backpack.  It has been a steep learning curve!  And now I am thinking of using a waterproof spray on the seams.  The pack is made of Xpac and Cordura, both waterproof.  I am wondering if there is any utility to spraying the seams to make them more water resistant.  I am not trying to make a waterproof pack–I always use a liner.  I am not interested in taping,  but it I can make it more water resistant easily, then I’m in.  Any one have experience using spray on the seams?  Thanks!

[Patrick W]

Alright, I’m taking the silence to mean that I should try it and report back on how it works.

[Franco Darioli]

I have painted the seams with diluted silicone (same as tent seam sealing) . That penetrates the seams and swells up the thread (if porous) a bit. I doubt very much that , because of abrasion, a spray would be effective.

[Nick Smolinske]

No experience with spray. But urethane sealers will stick better to Xpac and cordura than silicone ones in my experience.

That said, I wouldn’t bother since the cordura will lose it’s waterproofness so fast anyway.

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