Homebrew PCBs

Slowly but surely I get the impression silicone is just not suitable
to make CuCl tanks with.
The current one has held some years, but finally sprung a leak as well.

I was quite pleased when, after not making a board for many months, I
held a perfect toner transfer in hand within 5 minutes.
However I was less pleased when I lifted the dust cover off my tank,
and discovered it had leaked. Luckily it is positioned in a large
plastic box which contained the etchant just fine. Must have been a
while too, since the tank holds over 2 liters and I recovered well
less than one.

I've had a number of tank leaks now, which leads me to believe that no
matter how wide the seams are the CuCl will eventually crawl out under
the silicone.


I need homemade boards so infrequently now I'm not sure if I will even
make a new tank just yet, but it would not be sealed with silicone.

Are there any alternatives to welded plastic if one wants a narrow
shape and dimensions that can't be found in any existing tank?
Anyone tried two component epoxy? On glass? Some other glue?

ST