Dum Dum Around heater core cover on engine side of firewall

[Michael M.]

Re: Dum Dum Around heater core cover on engine side of firewall

3M's part number for strip-calk (dum-dum) in the color of black is #08578.

[Donald H.]

Re: Dum Dum Around heater core cover on engine side of firewall

Joe,

I don't know if the straight DAP stuff sits up, but the mix I used with it and the Naptha did harden up to where it is stiffer than regular dum-dum.

[Dan D.]

Re: Dum Dum Around heater core cover on engine side of firewall

FYI, Gardner Bender makes black duct seal, aka dum-dum. They are in Milwaukee, WI. I believe Ace Hdwr carries it.
P/N DS-110
1-800-624-4320
gardnerbender.com

Same stuff as back in the days. I have a box of it and am using on my 57.
-Dan-

[Bob S.]

Re: Dum Dum Around heater core cover on engine side of firewall

Joe,

Use the black 3M strip caulk. It is available from auto body suppliers, Paragon, and I think Corvette Central.

Dennis

You're correct, and i bought some recently from Paragon;

3M STRIP CAULK

Paragon Number: 13786
GM Part Number:
3M strip caulk, black. Box includes (60) 1-foot strips. This soft non-hardening caulking material comes in easy to use one foot lengths and works for all types of seams, joints and openings. This product is easily thumbed into place and smoothed with a finger. It may be painted immediately, and has a non-sag consistency for vertical and overhead applications. There is no shrinkage and it adheres to metal, paint, glass and rubber. Completely waterproof and will not dry out or crack. Commonly used on various areas of the Corvette including the windshield area, door access panels and bolts going through the body.
Years: 1953 - 1982
Condition: New
Packaging: Each
Type: Stock
Additional Notes: Non-Returnable



Price: $22.00
Stick With Us Price: $19.80

[Keith R.]

Re: Dum Dum Around heater core cover on engine side of firewall

FYI, Gardner Bender makes black duct seal, aka dum-dum. They are in Milwaukee, WI. I believe Ace Hdwr carries it.
P/N DS-110
1-800-624-4320
gardnerbender.com

Same stuff as back in the days. I have a box of it and am using on my 57.
-Dan-

I see this stuff on Amazon and e-Bay as well as on the Home Depot site. My question is: in the photos, it appears green. Is it black or a greenish color?

[Richard M.]

Re: Dum Dum Around heater core cover on engine side of firewall

I get my 3M Strip Caulk at NAPA....Often in stock at my local store. Part Number: MMM 08578

Rich

http://www.napaonline.com/Catalog/Ca...578_0006438141

[Daniel Y.]

Re: Dum Dum Around heater core cover on engine side of firewall

dum dum or rope caulk is too ridged for this application. original sealant was slightly runny . I have found a product that is very close - Flex Seal

http://flexsealdirect.com/?gclid=CP2uq6yI27kCFcuY4AodXxkA2w

or a spray roof sealant will work fairly well.