I am not exactly sure of your set up but why not use silicone sealer on one side and waxed paper on the other to get a perfectly formed gasket.Put the waxed paper on the side you do not want sealed and the silicone on the other.
Just be sure the wax paper does not rip and allow the sealer to stick to both sides.
Learn to let go of what does not serve you ,but forces you to serve it
Just be sure the wax paper does not rip and allow the sealer to stick to both sides.
Learn to let go of what does not serve you ,but forces you to serve it