Heater Box-Sealing the two halves

[NHCharger]

I currently have my heater box apart to decipher and fix the vacuum actuators and vacuum lines. The previous owner(s) used caulking and tar to seal the two halves making it difficult to pull apart.
When I put it back together should I use seam sealer or maybe some weather stripping that you can get a HD for sealing doors? Can't tell what the factory used at this point.

[The70RT]

I use this - http://shop.ebay.com/?_from=R40&_trksid=p3984.m570.l1313&_nkw=strip+calk&_sacat=See-All-Categories

[A383Wing]

Yea..I have used the strip caulk as well....easy to use and work with

[tan top]

I currently have my heater box apart to decipher and fix the vacuum actuators and vacuum lines. The previous owner(s) used caulking and tar to seal the two halves making it difficult to pull apart.
When I put it back together should I use seam sealer or maybe some weather stripping that you can get a HD for sealing doors? Can't tell what the factory used at this point.

body calking   from 3m

D'oh  too late   

[NHCharger]

Wow, thanks for the fast replies guys.

[moparguy01]

I've always used butyl windshield tape. It's messy but seals real well. Heaven help you when it's time to take it apart again though.

[The70RT]

I've always used butyl windshield tape. It's messy but seals real well. Heaven help you when it's time to take it apart again though.

I'm glad I used the caulk as many times as I had mine apart lately trying to get an aftermarket coil to fit.

[doctor4766]

Looks to me like the strip caulk is probably made of the same product as the butyl tape used for windshields anyway.
If it is, the trick to stop it from being messy when removing it is to pull on it quite sharply, not slowly, as you endeavor to remove it. And the best advice is to not try and remove it on a hot day, as it will stretch out like chewing gum and make it difficult to remove. 

[The70RT]

Looks to me like the strip caulk is probably made of the same product as the butyl tape used for windshields anyway.
If it is, the trick to stop it from being messy when removing it is to pull on it quite sharply, not slowly, as you endeavor to remove it. And the best advice is to not try and remove it on a hot day, as it will stretch out like chewing gum and make it difficult to remove. 

No, you can handle the caulk and it wont stick to your hands. It is more like play dough then butyl. You can break it off in pieces and it doesn't stretch.

[doctor4766]

Ah ok, I stand corrected

[charger2fast4u]

i am restoring my heater box on my 71 ford crew cab right now i picked up the foam insulation tape from lowes. it reminds me of 2 sided tape except on side is sticky and the other is a foam material they sell it in rolls i figured this would be best incase of future repairs not having to have to pry apart any butyle tape or anything.

[The70RT]

i am restoring my heater box on my 71 ford crew cab right now i picked up the foam insulation tape from lowes. it reminds me of 2 sided tape except on side is sticky and the other is a foam material they sell it in rolls i figured this would be best incase of future repairs not having to have to pry apart any butyle tape or anything.

The factory box in my 70 had both on different areas within.