I thought I would up date this thread and tell you how the installation went.
The installation went well. I epoxied the floor with a penetrating epoxy following the success and excellent results "Top" had.
I used a different brand epoxy. I use Aeromarine and liked it very much. I also built a custom shower pan with it by the stitch and glue method used in some boat building.
Anyway, I faired the joints with cabosil thicked epoxy and sanded it and sanded it some more. I am telling you it is a lot of work. I blended in some old solid plywood floor with the new marine plywood I installed. I epoxied the underside perimeter as well before installing. By the way I didn't bend the elevator bolts. I slapped epoxy on them and ,in some cases, also double nutted them.
I did a lot of sanding knowing how the marmoleum telegraphs every imperfection. The old floor between the wheel wells was solid but not flat I made it much better but short of perfect. I am all about craftsmanship but part of craftsmanship is to know when a trailer floor is not a piano. This is not an excuse it came out well.
I dry laid the M in after a couple of vacuuming and a hand wipe down with blue shop towels. It was 100 degrees in the trailer but the M was supple and just laid down like it was glued down. This showed me something I didn’t like I work that joint a little more and the results weren't bad.
I installed the M in the morning when the temp was about 75. I sweated through my shirt as I worked fast not wanting the mastic to skim over and not knowing how long I had before that happen. I used a 1/16" x 1/16" square notched trowel. It went well and when done immediately rolled it with 100lbs roller. I rolled it first across, then the length and on the diagonal and then the length again a time or two
By the way, you will notice I did not go under all the cabinets with the M. I am watching the weight of my changes and new installs. My M weights 9 oz per 12” x 12” and as we all know oz makes lbs.
Also I love the stuff. I love the smell of it. It smells much like the flax seed oil I use on my cutting boards I sell at shows.
Anyway a special thanks to Lance M. for his example on Abby.