[Chaser]

I bought an enclosed trailer this past spring. I painted to inside of the floor with some sort of deck paint/stain (I don't recall what exactly it was), but the underside is still bare plywood. What has anyone else used to coat the underside of your trailer floors? Thinking used motor oil.

 

[Kster526]

Mine is as it was when I bought it.
Not sure other than under coating it.
Drain oil is a good idea but may seep thru and affect your nice paint on the inside. Not sure what I’d use , Thompson’s Water Seal?