Leaky water tank fix?

[Joyride]

Gang I'm getting ready for a big trip and have been checking all my systems and found a leak near the top of my aft water tank on my 91 mk1.5.  There's an indent where the tank fits below the steering quadrant and I've sprung a leak in the crease there.  Its easy to get the tank out but does anyone have a recommendation for fixing this leak.  It's like a pinhole leak and I was thinking I could spread some epoxy on there and call it good.  Anybody have any other tried and true methods?

[Noah]

There were several posts/chains on this very tank repair issue in the last few weeks. It is possible to "attempt" a repair. Do a little digging/scrolling/searching of recent posts--you will find it. Start here? http://c34.org/bbs/index.php/topic,9259.msg68134.html#msg68134

[Ron Hill]

Joy : The real way to fix that leak is to hot air weld it.
 
Being only a pin hole I'd clean the "hole area" with acetone and try a piece of metallic duct tape over the hole.  I believe it might hold.

A thought

[Joyride]

FYI I bought the 16.99 Plastic Welder and gave it a go.  It looks to be crude but effective.  I'm not sure if I want to post pictures of my first plastic weld, but it seems to be holding all right.