Best Roof Rack silicone

Is there a specific silicone that you guys would recommend to use on the roof rack mounting holes?

Ive seen a black one used, but dont remember what is called.

 

I wouldn’t use silicone. I’d recommend 3M 4000 Marine adhesive sealant or similar

 

Yeah, that's good stuff. Can be pretty messy to work with, so practice a little before applying to the truck.

Here's 3M's comparison of their marine sealants: https://multimedia.3m.com/mws/media/1736549O/3m-marine-sealants-comparison-guide.pdf

 

Don’t use

$23 3M 5200 (06500) Permanent Bonding and Sealing for Boats and RVs Above and Below the Waterline Waterproof Repair, White, 10 fl oz Cartridge

3M 5200 if you ever want to remove it!

 

I used the GE silicone on mine and it hasn't leaked in 7 years now.

 

Friends don't let friends use silicone. Use a urethane sealant instead e.g. Sikaflex 221.

It has many advantages over silicone, but the best thing is that it sticks to itself: if you find yourself having to make minor repairs/touch-ups down the road, you don't have to strip the surface before adding more.

 

^^^ That’s good stuff too

 

vssman Thank you for the clarification. Im going with the 3M 4000. Im glad I didnt get the 5200 one. Thanks again.