- Jun 9, 2018 at 11:46 am #3541105
Geoff CaplanBPL Member
@geoffcaplanLocale: Dartmoor, Devon
I noticed that on the web page for their Seam Grip adhesive, McNett claim:
“We have had users make tents and tarps without stitching by simply bonding all the seams with Seam Grip. The results have been incredibly strong, waterproof shelters.”
If this really worked for, say, a tarp ridge-line, it would have obvious advantages, as sewing must weaken the fabric somewhat, and it is a source of leaks.
But I’m pretty skeptical, as no reputable manufacturer is doing this commercially, so far as I’m aware. But perhaps this is for commercial rather than technical reasons?
Does anyone have experience of using this technique for a tarp or tent? Has it proved durable? How specifically did you make the seams?
My shelters get heavy use and are sometimes exposed to big wind loads, and I’d be using RSBTR Silpoly PU.
I’ve asked McNett for more info, and will post anything of interest that comes back.Jun 9, 2018 at 2:29 pm #3541111
Jerry AdamsBPL Member
@retiredjerryLocale: Oregon and Washington
would seam grip bond to silpoly PU?
if you had to use silicone, I don’t think that’s strong enough
if you seam grip a lap seam and pull sideways on it that might work, it’s pretty strong.Jun 9, 2018 at 10:04 pm #3541177
@rcaffinLocale: Wollemi & Kosciusko NPs, Europe
The PU version of conventional Seam Grip will bond to PU coating fine, but NOT to the silicone coating.
I did see mention of a silicone version of Seam Grip – if true that would bond to the silicone coating well, and to the PU coating only medium.
CheersJul 12, 2018 at 5:12 pm #3546545
William NBPL Member
I’ve attached webbing to make a ground cloth that would hold my BigAgnes tent poles. I used ShoeGoo, so I would think McNett would work. Surface area of contact is the critical factor, and if the material stretches more than the sealant, it could work loose over time.
What I also know is that 100% silicone caulking smells different from McNett, but is about 1/6 the price and works exactly the same. (thin with mineral spirits, paint thinner…) Also non-silicone Seam Grip doesn’t work on Silnylon, but silicone sealer (theirs or GE from HomeDepot) works on everything.
What’s really needed is a way to lay down a consistent width and depth of sealant.Jul 13, 2018 at 1:31 am #3546588
Jim ColtenBPL Member
No-sew silnylon tarps are possible using GE Silicone II glue, I do not know about Seam Grip. This 8 year old tarp is almost no-sew … the only sewing was to attach a zipper the beak. It is an adaptation of the Jay Hamm tarp published in BPL’s early years.
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