who sells silnylon tarp tie outs?

I think you are thinking of adheasive backed clip anchors/ tieouts made for Cuben?

I am pretty sure anything you attach to sil needs to be sewn ..

I’ve never seen stick on tie outs for a sil tarp but there are these

Not much sticks to silnylon

That is correct … but “not much” does leave room for something … silicone based adhesives. GE Silicone II glue/sealant is one such product.

This BPL MYOG article describes the process (available to full annual or lifetime BPL members or by a fee for just that article)

disclosure: I am the author and received a small fee when it was published but nothing based on your buying it.

Jim,

Point taken.

I'm fully aware of GE Silicone's properties. I've made wax casting molds from the stuff for over 25 years.

Yeah, it will stick to silnylon(so will ShoeGoo ,etc.), but would you depend on the stuff SOLELY to attach an anchor or tiepout?

I sure as heck would not.

And full disclosure…

I made not one penny from this post…lol.

There are these from Sierra Designs:

http://www.amazon.com/Sierra-Designs-Grip-Clips-PK/dp/B00C38JA9Y

I've never used them before and don't know how they would work.

Short of learning to sew, your local seamstress might be able to add one on. Or you could send the tarp to a company like Oware and maybe Dave could add on your tie out

> GE Silicone's properties … Yeah, it will stick to silnylon(so will ShoeGoo ,etc.),
Actually, no.

ShoeGoo is a very fine PU adhesive. I have used tubes of the stuff over the years – repaired the duckbill on my 3-pin ski boots once, and that lasted 'for ever'.

But PU only lightly adheres to silicone; it does not bond to it. It will peel off under a light load. On the other hand, the siloxane adhesive used on the right silicone tapes will chemically bond to the silicone coating in a permanent manner. Been there, tested that, used that.

Cheers

ShoeGoo hss tenacioisly stuch to pretty much everything I have tried it on.

If you were going to simply glue on a tieout to a piece if 1.1 sil ,how would you do it without it ripping out under a stress load?

Just asking,I'm curious.

Good question. You have to look closely at the tie-out to see what can go wrong.

In my experience, a big problem is that the tie-out itself is usually stronger than the sil, so it will stretch differently – rather less in fact. That means the sil tends to stretch more under load and this places a very large fraction of the strain at the leading edge of the joint. This can overload the adhesive at that small area so it fails. Then the next bit of the join is overloaded, so it fails too.

To overcome the bad effects of this difference in stretchiness, you have to spread the load over quite a large area. You still get the differential strain, but if it is spread over a large enough area the adhesive may hold.

In reality, I first reinforce the tie-out area with a single layer of sil, sewn around the edge, then I sew and maybe glue the tie-out to this reinforced area. In other words, I do not rely in the adhesive alone. I sew.

Now, it may be that some nylon and Cuban spinnakers have their tie-outs all bonded, but the complexity of the tie-out area in some ails has to be seen to be believed. You may end up with 4 or 6 layers of fabric there, spreading the load out. Then the engineers get in there and test the design to destruction.

Cheers