The thread I'm looking for is by a member who did a very detailed account with pix of using 5200 on the plastic strips. I remember he used weightlifting weights to clamp the strips down while the 5200 cured.
In my application the tank will be sitting on the bottom of the coffin not on a platform and I don't want to 5200 the tank to the bottom of my coffin in case I need to remove it at a later date.