Advice on how to glue pond liner to rocks

[Jo595]

Hi everyone
I have built a frog pond incorporating some naturally placed sandstone boulders as part of the edge of the pond.
I would like to leave as much of the boulders exposed as possible and am looking for advice on how I could attach or “glue” the liner to the sides of the boulders as close to the water line as possible. It won’t be weight bearing it’s just to stop water getting under the lining and to tidy up the edge

Thanks for your help

 

[combatwombat]

What type of liner? Maybe an exterior construction adhesive. Boulder will need to be cleaned where adhesive is applied.

 

[Jo595]

What type of liner? Maybe an exterior construction adhesive. Boulder will need to be cleaned where adhesive is applied.

 

[Jo595]

It’s 0.8mm up stablised pvc flexible pond liner.

 

[brokensword]

pvc flexible pond liner.

ruh roh...

 

[j.w]

@Jo595
Not a very strong liner to work with are some other words for @brokensword 's comment of ruh roh

 

[poconojoe]

Agree about the lack of durability of a PVC liner.
I experienced this when I was a newbie at this.
It was horrible. It sprung a bad leak in the middle of winter. I was adding 300 gallons of water every week until Spring arrived when I was able to change the liner to 45 mil EPDM.

Anyway, if I were to attempt what you want, I would do this...
Thoroughly clean the boulder. Run a bead of PL-S30 to stick the liner to the rock. Then I would use a strip of either wood or stainless steel over it and fasten that by drilling holes through it and the liner into the boulder. A wood strip might look better, be cheaper and more readily available.
You can stain and polyurethane the wood to make it less noticeable and more durable.

I would use a hammer drill (rotary hammer) to drill the holes into the rock and use plastic (Rawl) bantam plugs as anchors. I would use #10 stainless steel sheet metal screws and fender washers.

 

[Lisak1]

My advice - don't. There are many ways to edge a pond to make it appear that those natural rocks are part of the whole build and still build it so it holds water.

 

[addy1]

Welcome to the forum!

Try to not glue or put too many heavy rocks etc on the liner, put a piece of something between the rock and the liner. That is not a real tough liner.