Caulking In Bed

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

custodian

Full Access Member
Joined
Apr 15, 2016
Posts
959
Reaction score
554
Location
Catawba
First Name
William
Truck Year
1973, 1985
Truck Model
C10
Engine Size
5.3 LS, 350
Can anyone tell me what type the caulking is on the inside of the bed and where I can buy some?
 

waterpirate

Full Access Member
Joined
Jan 2, 2019
Posts
838
Reaction score
1,875
Location
delaware
First Name
Eric
Truck Year
1987
Truck Model
v10
Engine Size
5.7 tbi
I think it is just generic seam sealer?
Eric
 

PrairieDrifter

Full Access Member
Joined
Dec 28, 2014
Posts
3,477
Reaction score
4,604
Location
North Dakota
First Name
Mason
Truck Year
84,79,77,70,48
Truck Model
Suburban k10, bonanza k10, c30 C&C, c10, gmc 1/2ton
Engine Size
350, 350, 350, 350, 350
Get 3m for sure.
 

Randy and Easton

Full Access Member
Joined
Feb 6, 2021
Posts
891
Reaction score
1,265
Location
North Richland Hills, Texas
First Name
Randy
Truck Year
1976
Truck Model
C-10 LWB
Engine Size
350
We used NP1. Got it in a bunch of colors at Lowe’s about $7 a tube. Used it on cab floor repair sealing top and bottom and bed seams before rhino lining. It’s been over a year and we are water tight everywhere and no cracking even in Texas heat.

Randy and Easton
 

Attachments

  • IMG_1640.jpeg
    IMG_1640.jpeg
    252.9 KB · Views: 66
  • IMG_6455.jpeg
    IMG_6455.jpeg
    148.3 KB · Views: 62
  • IMG_6216.jpeg
    IMG_6216.jpeg
    83.2 KB · Views: 58
  • IMG_6219.jpeg
    IMG_6219.jpeg
    92 KB · Views: 61
  • IMG_6217.jpeg
    IMG_6217.jpeg
    131.3 KB · Views: 57
Last edited:

CalSgt

Full Access Member
Joined
Oct 3, 2021
Posts
1,521
Reaction score
3,222
Location
CA
First Name
Casey
Truck Year
1980
Truck Model
Chevy K-10 Custom Deluxe
Engine Size
350
I agree with the 3M seam sealer recommendation, my Dad recommends 3M Fast 'N Firm (08505) but I haven't used that one yet. I have used a few tubes of 3M Urethane (08362) and have been very pleased with it.
 

waterpirate

Full Access Member
Joined
Jan 2, 2019
Posts
838
Reaction score
1,875
Location
delaware
First Name
Eric
Truck Year
1987
Truck Model
v10
Engine Size
5.7 tbi
When you talk about seam sealer and 3m it is like going to baskin robbins for ice cream. Their product range is huge and they have a flavor or two for every application. Read the labels and make sure you get the one for your usage.
Eric
 
Joined
Nov 14, 2018
Posts
42
Reaction score
105
Location
Ocala
First Name
Mike
Truck Year
1988
Truck Model
K-5
Engine Size
350
I used 3M 5200 marine. You can normally find it at you big box stores. I use it because it doesn't dry as fast as the automotive seam seal, so you time to come back and smooth it out if needed.
 

Scott91370

Full Access Member
Joined
Apr 2, 2018
Posts
933
Reaction score
904
Location
Burleson, Tx
First Name
Scott
Truck Year
1985
Truck Model
Sierra1500
Engine Size
350
I dodn't seal my seams when I put it back together. Guess it could come back to bit me but I figured water will just pass through and not get trapped.
 

Grit dog

Full Access Member
Joined
May 18, 2020
Posts
6,017
Reaction score
10,054
Location
Washington
First Name
Todd
Truck Year
1986
Truck Model
K20
Engine Size
454
I dodn't seal my seams when I put it back together. Guess it could come back to bit me but I figured water will just pass through and not get trapped.
No, it will just trap crap and try to rust. Not your truck likely since it looks like a garage queen, but that’s why the seams in the bed are sealed.
 

Grit dog

Full Access Member
Joined
May 18, 2020
Posts
6,017
Reaction score
10,054
Location
Washington
First Name
Todd
Truck Year
1986
Truck Model
K20
Engine Size
454
I used 3M 5200 marine. You can normally find it at you big box stores. I use it because it doesn't dry as fast as the automotive seam seal, so you time to come back and smooth it out if needed.
I’m sure it works great. I feel it’s basically the same stuff as auto seam sealer, having used both, as both are urethane sealant. Never looked to see if 5200 is paintable though as I’ve only used it in marine applications.

That said, the few different urethane seam sealers I’ve used did not cure too quick to smooth out.
Fwiw inside of bed was never smoothed out from the factory. Just a continuous bead.
 

Latest posts

Forum statistics

Threads
42,201
Posts
911,215
Members
33,696
Latest member
brianbones
Top