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Waterproof, flexible adhesive for two polyethylene tarpaulin sheets?

Waterproof, flexible adhesive for two polyethylene tarpaulin sheets?

Waterproof, flexible adhesive for two polyethylene tarpaulin sheets?

(OP)
Hi there, i'm new to this forum and looking for some specialist adhesive advice.

For a current project i'm waterproofing the side of a shed (5m x 2m) on a very tight budget. I picked up a lightweight polyethylene tarpaulin measuring 5m x 4m for a very good price, however, the tarp may not be strong enough to withstand the elements year after year (80gsm). What's more, some reviews even claim that the tarpaulin is not fully waterproof!

So my idea is to simply double the tarp up, thereby doubling its thickness and making it the right size for my 5m x 2m shed. I was thinking, further, that if i can glue the two halves together with something that would increase its resistance to water, then i'm onto a winner. Thing is, i have no idea what to use. HH-66 vinyl cement is meant to be superb, but i'd need about a gallon to cover 20m2 (according to the manufacturer) which would be more costly than purchasing a high quality tarpaulin that would do the job instead. Contact adhesive would probably also do the job, but again since, i would need to cover 20m2 (i.e. both sides) the cost and frankly annoyance of trying to paint 20m2 of contact adhesive makes it unfeasible. So, in summary i need something:

* To adhere two 10m2 halves of woven polyethylene tarpaulin together.
* To act as a waterproof layer
* That will still be reasonably flexible when set
* That's easy to apply with a paint brush or roller (or can be sprayed)
* That isn't going to cost more than say £15 ($25) for a sufficient quantity

Something like PVA would tick all those boxes, except of course for the waterproof bit! Thinking outside the box slightly, it actually doesn't matter if the two halves don't adhere, since they will be fixed on top of each other around the edges anyway. A flexible waterproof varnish in between might also work!

Look forward to hearing your advice.

Sam smile

RE: Waterproof, flexible adhesive for two polyethylene tarpaulin sheets?

Waste of time.

Polyethylene is notoriously difficult to bond well in the best of circumstances. Slopping on goo on your driveway is not going to cut it.

At any rate, from a waterproof performance perspective you'll be better off with the double tarps as separate layers. The inner layer will only need to deal with whatever moisture gets through the outer.

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