Sealing Dust Leaks at Tailgate Corners

Any ideas how I can seal these leaks? Foam tape doesn't work - it compresses and doesn't regain its shape, and the adhesive doesn't stand up to the desert heat.

 

I don't know of much that last long in that, I mean shaped foam would just crumble away from heat after so long, a nice molded piece of rubber gasket material or something would be good I think, like to fill most of the void not just block one end of it at the interior. I get alot of dust in my tailgate at the bottom edge where it pivots, but thats like mostly 60mph on a dusty road

 

I hear you. My dust comes from 10-30 mph on Nevada and Utah's gravel and dirt roads.

I can probably take care of the bottom corners, and I've already sealed the sides, but the top corners and especially where the topper meets the end of the bed rails is a problem.

 

Try this for sealing the gap between the bottom corner of your topper and top corner of your tailgate: http://www.bajataco.com/camper/camper_seal/index.htm

Try this for the bottom corners of your tailgate: http://www.realtruck.com/tailgate-seal-kits/