Contrary to what some will claim, there is NO adhesive that is
considered suitable to use with the type plastics the preforms are
made out of. You can slather on silicone, put liner patches on them
and a heap of other things.......but its certainly nothing I would
ever, ever trust. Best bet is use a hot air plastics welder and do the
repair right. You can cut small slivers off the preforms lip for
filler material and melt it into the cracks.....I have fixed many
preforms I find that way, and last year welded 6 preforms together,
that Walmart had cut in half so they cold not be salvaged when they
threw them in the dumpster......and not a one of them has
leaked.........

If you go with the silicone or polyurethane sealant, you still need to
scab a patch on top of it and use sealnat between patch and preform.
It also needs some form of mechanical fastener as well as it is very
capable of peeling up and coming off, as nothing sticks properly to
the PP or PE type materials.......You can use stainless steel pop
rivets, small stainless sheet metal screws, or stainless
stovebolts.......I fyuou use pop type rivets make sure to get sealant
in the stem hole and over the head or it will seep.


On 25 Jul 2005 11:45:35 -0700, "john"
wrote:

===Someone recently gave me a small pre-formed pond, but it has three 1-2
===inch cracks. I was wondering what the best way to patch them would be.
===Perhaps a bicycle tire patch, or silicone? Thanks.


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