Reseal Mack Windows

The Mitten

Well-Known Member
Jan 27, 2021
110
6
Grand Ledge/ Ludington MI
Windows out. On the bow are the implements of destruction. I found the small putty knife with a deadblow worked best, tapping it in until it bottomed out to the inner part of the frame. The 6" worked for the bottom and the top because it is flexible. After working with a small 18mm utility knife cutting away the silicone caulk, I got the bottom window out. I am certian it wasn't leaking there. I think I'll leave the top hinged window in, and just replace the rubber. The rubber looks pretty dried and the frame to boat sealent was a very thin bead, and had many gaps. Hopefully new rubber and sealing the window to the hull will fix it. Ill post more as I move along.
 

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The Mitten

Well-Known Member
Jan 27, 2021
110
6
Grand Ledge/ Ludington MI
Need to do the same on my 1990 mack and following.
The project has come to a halt due to a kitchen remodel at home. I did call to order the window rubber seals. $7.00 a foot, minimum of $100.00 order and a 15% surcharge on the overall order cost. I checked around and this is the best I could find.

When I get back after it I will follow up with pictures and the procedure.

Kurt
 

Robert Daber

Well-Known Member
Feb 25, 2018
215
13
Point Pleasant, NJ
Butyl seal tape would work good for setting the frame on the boat. It doesn’t harden and stays flexible and no mess. Tape is 1/8” thick. Tighten down the frame and cut excess off that squeezes out with a utility knife.
 

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Mistress

Moderator
Staff member
Supporting Captain
Jan 22, 2005
7,530
245
San Jose, CA
Butyl seal tape would work good for setting the frame on the boat. It doesn’t harden and stays flexible and no mess. Tape is 1/8” thick. Tighten down the frame and cut excess off that squeezes out with a utility knife.
I used some of that a mounting a couple fixtures to my camper. Seals real well, but it does continue to "bleed".
 

Robert Daber

Well-Known Member
Feb 25, 2018
215
13
Point Pleasant, NJ
My windshield frame just has what looks like butyl tape under it. There is no caulking. Mistress mentioned which is true that over time butyl can bleed out and I think that might be from clamping pressure over time and you can clean it up easily with a utility knife. It seals and cosmetically I think it looks better then caulk. If you caulk I would put down some painters tape so when the tape is removed you have nice clean straight lines.
 


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