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If you are going to show it, and want to get every last dollar out of it, ANY bedliner will take away from the value, however, if you just enjoy it and will use it for small things but would like to protect the bed, and you are on a more practical side, if I were to look at an older truck to purchase and it had a spray in nicely done bedliner, that would only ADD to the value in my opinion. As for the diamond plate side covers,,,, nope, to me those would detract value, if nothing else bring the bedliner over the top and down some. I am going to go over the top and down about 1/2"- 3/4" on mine.
Thanks for all the opinions. Again, the hard plastic liner is not even for consideration. I don't like them, I used to have one. Money is not an issue. I just was wondering if the spray in would decrease value on a imaculate 77 F150, and if so, perhaps a bed mat that I can put in and take out is the answer. But based on many of your opinions, maybe a spray in Rhino SolarMax that is color matched and UV protected might be the answer. I was also considering a diamond plate chrome edge on the top of the bed rails and top of the tailgate. It would match the other chrome and bumper well.
I know us "dropin" liner guys are in the minority, but I have had drop ins for over 25 years and have never had a bed rust. The main thing about spray in type liners is that they are too permanent. I have seen PU's that the owner has tried to take out the spray in liner, not pretty. Drop in liners are too easy to pull back out periodically if you want to inspect the bed or sell it as an original. Again, I have had them for a long time and have never seen rust because of the liner.
If I was buying a classic truck with a spray in liner I would simply walk away ....
FWIW, I have a spray-in bed liner in my current truck that I am trying to seel ( not my 76 F150), and here are a couple of downsides of spray-ins that I have noticed:
1) spray-ins are NOT indestructible - meaning, depending on what brand you get, don't plan on throwing shovels or mattocks in there the wrong way.
2) spray-ins can stain. I was doing a bathroom remodel earlier this year and some dry cement spilled and set down in the liner and there is a light-discolored portion of the liner that won't come out. Haven;t tried an acid scrub, but anyway.
I'm not advocating drop-ins, but just some input on spray-ins.
IMO,
D-
I had the thick plastic liner in my Dakota. I loved it and can't imagine how a spray on would protect against bricks, rocks, firewood, etc being thrown in the truck. Of course I never looked under it for rust. I read somewhere you want to take a big block of parafin wax and coat the bed real good before you put one down. I am looking for one for my '76.
If the truck originally came with a wood bed, no spray in. Nobody would do that anyway. Your truck, of course, came with a metal bed so a spray on is fair game.