What
@baldilocks said is spot on. - We masked using tape folded in half back on itself, 1/2 touching the object, 1/2 holding the paper coming off the rolls.
We had to do it that way to tear off the paper, then run a razor lightly to cut that bevel edge you see on exposed edges.
Going from memory we had the gun pressure about 65-70psi (had to keep shop heated 24/7, as totes of the bianary agents temp was 100% related to how we got that signature “flat but textured” -finish.
The gun was 2 hoses where the mixing happened in the gun tip that was a replaceable mixer, the gun fed from 2 seperate chem totes & one had black already mixed, and we kept a smaller one of clear that was the same stuff as the pre-mix black - to mix for people who wanted a color (why color liner is big $$$).
In the heat of Summer we turned down the PSI as we didn’t have an A/C unit & anything over 70* ambient was hotter than the shop.
FWIW, a good bed job is 3/16” in the bed floor & 1/8” on the vertical bed walls.
I’m not fond of Line-X due to the rock-hard surface, but that’s me.
— If you choose to go anything but black, be warned that it faded faster than paint, even when I talked to a Rhino shop in B’ham back when I got the Tundra.
— A new player in the bedliner for autobodies (since it’s so common now) is these guys:
Bullet Liner – Spray-On Bed Liner for Truck Beds & Off-Road Vehicles.
Those guys cracked the code to colormatching paint codes, and can do real wild & complicated / multiple colorways in a final product.
Full disclosure, I’ve only seen sample tiles of their product but a buddy wants to open a shop & wants me to come onboard since I had the time in with Rhino & have had those “aww, crap” moments.
I’m jaded but only because another liner shop is locally doing really good work in black-only (they are Armor Coating franchised), so we’re already in a saturated market for how few people we are here.
But if you find you have a Bullet guy around, I’d go check them - esp if you want a color other than black.