Got the seam done today it was a challenge The old rubber was folded over making a round out of the liner corner. and the bog has 6" of water where I had to stand to make the seam. This picture shows the double sided tape applied to cleaned epdm I use gasoline and then install the primer using a common scrub kitchen pad making circular motions scrubbing as you go ." no soap infused in the pad" Let the primer DRY FULLY clean and Apply primer to the other piece you want to seam the rubber to apply the primmer to that piece let the primmer dry fully. Lay the rubber and primer over the seam tape leaving the plastic film in place for now. then when the liners are lined up and smooth start at one end pulling the plastic out from underneath smoothing the two rubbers together and needing them so as to not allow air bubbles. work your way all the way down your seam and when done use a common wallpaper seam roller or a hard roller to fores the two together. Picture 1 and 2 I should add you get one chance and one chance only to get it right . this is contact cement once you touch the two material together it's done and can not be moved. The more help the better though i had none but i have done many seams over the years
Picture 3 i apply a bead of caulking to the seam so at this point i have a seam with the seam tape and a seam with the caulking
Picture 4 is both surfaces that were just seamed and caulked clean and prime" allow primer to DRY FULLY . lay out the top seam tape leaving the plastic on untill you have the seam tape lined up. When you do and the rubber is flat and smooth begin pulling the plastic out slowly working the tape onto the primer and centered over the seam
And the last step is to apply caulking over the entire seam .
This will make for a BULLET PROOF SEAM ! Though it doesn't look like the rubber in the last photo was clean i assure you where it was caulked and seamed was spotless.
1. Double sided seam tape
2. Genocil 4500 caulking
3. Single sided seam tape
4. Genocil 4500 caulking
The final product has 4 methods of sealing to the two pieces of rubber.