I know it can’t be completely eliminated. ’17 f150 spray in liner. Has always loaded up with gravel dust. Any recommendations on a silicone or gasket material to put on the cracks. I can see daylight coming through in a few places where bottom of bed meets the sidewall. I did but a foam tailgate seal to try. Thanks.
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my buddy has tried several of the tailgate seals, None of them seemed to help much.as far as the cracks go, are you saying that the sprayed in bed liner has cracked? I’m a little unsure what cracks you could be talking about.
Referring to where the tailgate meets the sides & bottom of the truck bed, they sell vinyl like door seal kits/come with tonneau covers that you can try. Google truck best seal kit. I haven’t found a great way of keeping dust out myself but want to find something too.
I will echo the last 2 responses-i can’t keep it out. I have a pretty nice Diamondback cover with a rubber “seal” and it doesn’t keep it out. I just look at it as the price i pay for living in the middle of nowhere, which I’ll take. I just don’t put anything in the bed without acknowledging it’ll be covered in dust.
After many attempts with Access trail seal kits and X-tangs seal, I am of the opinion nothing really works all that well. I just got a new F-150 with the pro access tailgate and it’s really bad! I love the tailgate but the dust it allows in is the worst I’ve ever experienced.
If it’s been so long my bed is getting dusty, usually a nice meal out and a couple 3-4 cocktails work for my FW….oh TRUCK beds, nvm carry on. 
Around the perimeter where the bottom meets the sidewalls I’d do a polyurethane sealant like Vulkem. Clean everything real well with a pressure washer, get the oils off with alcohol. Then apply the sealant. I’d practice on something first, but the key with this stuff is to not touch it after it has been applied. No matter how much you think you can make it look better you won’t, it smears EVERYWHERE.
It should hold up to most abuse, but I doubt it would survive something sharp and forceful like the corner of a shovel.
Otherwise I have seen people install a fan in the cab with a duct running to the bed to pressurize the bed compartment. Obviously this is a bit more work but should fully eliminate most dust as long as you remember to turn it on when needed.
Thumper, it hasn’t cracked per say, but at the 90° joint where wall and floor meet I can see light coming through in multiple places. Not looking for a cure as I know that’s not possible. Just a “dust reduction.”
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