Trailer undercoating help

[LandCruiserPhil]

What product should I use to undercoat under my trailer and inside of the fenders?

 

[Mark Harley]

Aerosol can bed liner worked for me.
Solid and water proof, Better than spray undercoat.

 

[cowboy4x4]

I use Henry's 208R wet patch roof cement (brush on) on the frame and wood, its water proof and if you gouge it on the trail it is easy to touch up. Low cost compared to other products but just as effective.

 

[Aspen Trails Trailers]

I use Rhino Lining on my frame and fenders, seal the wood with wood treatment and the cover with plastic and seal edges with Dap 100% Silicone.