Which Truck Bed Liner for Sub Box?

I am building a ported box for a single 12w3 to go in the Drivers's footwell area in my 91 Supra Sunsport(tons of room down there). The box is 3/4" MDF. I am coating the inside of the box with resin but plan on doing the outside of the box with truck bed liner. Everything I do is on a budget so I'm hoping to use a roll on DIY bed liner in a can. I can do that for about $30 or less using the quart size can. The thing I'm hung up on is which brand to go with. There are several options out there: Rustoleum, Herculiner, Duplicolor, Duplicolor "Bed Armor", Raptor liner,...... Does anyone have any insight or recommendations on these or any others? I want something nicer than undercoat spray. LINE-X would be my first choice but there's really no reason for me to spend the extra money to have it professionally sprayed. Thanks in advance.