Advice for fixing pebble edge stone liner

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Morning all, Bit of a odd one this but here goes.... Approx 2 years ago I created a lovely fibre glass lined pond in my back garden which has matured over this time and is now my pride and joy.
When I fitted it, I glued pebble edge stone liner around the rim and about 30cm down into the pond to hide the green fibre glass material surround. It looked great but now after 2 years the glue holding the pebbles onto the liner has started to degrade and the pebbles are dissapearing leaving unsightly bare patches on the liner. (This appears to only be on the top of the liner and not the section submerged under water - I presume the Sun has caused this)
Rather than draining the pond down and replacing the pebble stone liner, I am going to attempt to use a glue to stick new pebbles onto the top of the liner to sort out the bare patches. Picture attached.
My question is what sort of glue/adhesive could I use to do this (The current adhesive is a light beige colour) that would be safe for the fish?
Any advice would be appreciated?
Thanks
 

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addy1

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I would try some polyurethane, clean the bare spots put some poly on it and stick in the rocks.
 
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Hi Addy1 and thank you for your advice. I am presuming this will be safe if any of the polyurethane comes into contact with the water.
 

Jhn

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Could also try super glue gel to reattach pebbles. It is commonly used in reef tanks to attach coral frags.
 
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You could try aquarium safe silicone, comes in clear and black, sold at pet shops or Lowe's. Comes with a fine tip tube so ycu could apply on each rock individually.
 
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You could try aquarium safe silicone, comes in clear and black, sold at pet shops or Lowe's. Comes with a fine tip tube so ycu could apply on each rock individually.

I was going to suggest the silicone, too - but if it's those teeny tiny bits of gravel you are reattaching, individually might be a challenge! I wonder how the silicone would hold up to the elements?
 
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I was going to suggest the silicone, too - but if it's those teeny tiny bits of gravel you are reattaching, individually might be a challenge! I wonder how the silicone would hold up to the elements?
Pure silicone should be fine; they make aquariums with the stuff.
 
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hmm, have had glass aquariums for over 40 years and haven't had to do that yet. Perhaps if they're not always immersed...
 

addy1

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Didn't think of silicone, we have it sealing our huge windows, full sun, winds, freezing that stuff doesn't go bad. Get the good stuff rated to last and survive water immersion.
 
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Thank you very much for all your replies. This gives me some great ideas. Silicone would certainly be an option, looks like I've got a time consuming job to do but should save draining down the pond and replacing the stone liner.
 
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hmm, have had glass aquariums for over 40 years and haven't had to do that yet. Perhaps if they're not always immersed...

Right - tanks that had been allowed to sit empty. The silicone would dry out. Maybe the newer products are more long lasting.
 
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Might not be as time consuming as you think; silicone/glue up a couple of areas (silicone does not set up fast at all) and take a handful of dry, clean pebbles, press this handful on the patch area, let the loose/not tacked ones fall into a container to be used for the next batch. This, as opposed to one at a time.

Michael
 

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