i also use fluidfilm but for other applications (i like that stuff!)
it is a wetter/tackier product even after drying.
the boe' t-9 does leave a waxy layer but it's drier and lasts much longer.
(i use it for bikes, aluminum frame kayak, the a/s skin, the receiver, hitch and 100 other alum/steel things...
after application, i WIPE most of the residual out of the drawer anyway.
ANY of the anti rust/corrosion sprays would be helpful, OR any rattle can of paint (there is even 'zinc sprays in a can)
the real key is better drainage and NO MAT to trap water.
the compartment WILL get wet inside from rain pooling at the lip
and especially while ON THE ROAD while raining AND from the hoses stored there...
it is often referred to as the "wet stuff drawer"
the galvanized coating is effective for the most part once the mat is out.
so the spray is just my lazyguy way of adding a bit more protection.
brand new and still VERY clean, consider a more permanent DIY metal coating...
once dry this would SOLVE the insides...
((but the UNDER SIDE is also an issue...
a/s REALLY should use somethin' else OR coat the drawer.