I don't see how it would get to hot.  It is applied over the existing floor and under the mats (bedliners tend to be slick) which only gets as hot as the air temp around it.  If anything it would help to insulate the floor just a little bit more. 

My old trailer had the spray in liner and it was never any hotter than any other trailer I've ever had.

Having gone down the floor pitting road unfortunately, I have explored the spray in bed liner option.

My husband has a friend who used to own a bed liner store - has since sold it so is an impartial consultant in this case.  The friend told us that the bed liner material may have trouble sticking to aluminum - particularly if the aluminum is ridged and not flat as it was in our case.  The friend said that it would initially look great but over time would probably start peeling away in areas.

We tried to contact WERM as that was another option but to no avail (no returned emails or phone calls) nor did it appear that there was a WERM dealer in our area.

The option I would have gone with if I had kept the trailer would be to put down a fiberglass resin over the aluminum that was designed for use with aluminum (used for boats).  The fiberglass resin is strong, light and adheres well to aluminum.  For looks, you could then spray in a bed liner over the top of the resin (and yes you would still need to use mats).

In the end, I felt cutting my losses was the best route to take as in my case, the corrosion was happening from top down as well as underside up. 

And for the record - I do not live in a marine area.  I do/did keep my trailer floor clean.  I pulled the mats regularly.  I opted in my next trailer to not have an aluminum floor....

I just bought a new Logan Coach XT.  All the XT and XTR models come standard with a Aluminum floor covered with a Vortex spray in liner. They coat all 4 sides of the aluminum planks used for the floor boards.  So their is no exposed aluminum. They space the aluminum planks so their is still drainage between them even after being sprayed. They also spray the inside walls of the horse area and under the gooseneck and box drop wall.

They also put in rubber mats on top of the sprayed floor.

I would assume the matts protect the Vortex coating from getting beat up by shod horses. The Vortex proctects the Aluminum from exposure and corrosion.

Over time maybe there would be enough movement with the matts to work grit and debris through the Vortex spray and expose the aluminum plank. But if somebody occassionally pulled the matts and hosed it out, I think it would be a long long time for the aluminim to corrode.

I too have a Logan XTR with the plank floor sprayed with Vortex.  I use this trailer constantly with a horse that kicks when she's mad (makes me mad too!).  Anyway, no damage to the walls, no scrapes or areas where the vortex is coming off.  It definately drains- seen this first hand as mine love to pee in the trailer!  The mats the trailer came with are thick and absolutely protect the floor as well as provide cushion- so far so good with this set up.

From what I've read the trick is to have the alum. prepped properly.