Prepare the liner by cleaning it with unleaded gasoline.
Clean a strip at least 6" wide along the edges of
both pieces of liner that you intend to put together.
The liner must be completely spotless and dry. Use a hairdryer
to fully dry the liner. Make sure to clean the upper side
of one piece and the underside of the other piece, so they
will overlap properly.
After the liner pieces are cleaned, it is time to splice
them together. Use the 3' or 6' wide tape made for splicing
EPDM liners.
Place the exposed sticky side of the tape along the edge
of the liner, in the strip area that has been cleaned.
Cut off any excess tape that's left over once you reach
the end of the liner.
Remove the paper backing that is covering the tape so
that the sticky glue side is exposed.
Next, lay your other piece of EPDM liner on top of the
sticky tape.
Make sure to overlap the liner so that it covers just
to the edge of the tape. Use a roller to seal the liners
and tape together.
Once finished, make sure that the liner and tape stick
together. You do not want any gaps. If you find gaps, fill
them in with additional tape.
SPLICING
A POND LINER 
