What to use for bed seam sealant?

[pinballlarry1]

My '81 Fleetside long bed is missing most of the seam sealant and after searching the internet, I am wondering what everyone else uses. Generic polyurethane? 3M specialty, or what? Looking for the best for Montana winters. Thanks.

 

[waterpirate]

3M for the win.
Eric

 

[ali_c20]

Any quality automotive or marine sealant that has a high temperature range.

 

[bucket]

Yeah, any automotive grade sealer. You will want something with a fairly heavy body and also something that cures semi-rigid.

 

[goldpack]

3m does have a question and answer line.

my 1986 has factory stuff that looks like grey caulk in a really thick bead inside the bed.

 

[Jrgunn5150]

I use Evercoat brushable, I used to use SEM but I think they quit making it.

 

[Sad Sack]

3M is pricey but an alternative:

https://www.amazon.com/dp/B0DBHCQCTR/

 

[Scruffy49]

O’reilly carries a decent line of products, just left there pricing stuff for the lowrider build.