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Sun Oct 04, 2020 3:03 pm

Im replacing my vapour barrier as it was letting water in the bottom, and I’m just wondering what people think about this - using an adhesive like one that’s brushed or sprayed on vs. a good double sided tape for the vapour barrier. I just find that the glue method is quite messy and at least with some kind of mounting tape it’s easier to keep it all neat and tidy. Is one necessarily better than the other, and does anyone have recommendations for particular brands?

Sun Oct 04, 2020 4:18 pm

If the mounting tape is thin foam (as most are), then it can hold water and will add to rust problems.

A couple of tips:
1) make sure you vacuum out the bottom the doors and clean the drains. Any dirt will act like q pong and cause rust.
2) Many such the very bottom INSIDE the door, so that any water making it that far doesn't get to the bottom of the edge of the masonite door card.

Sun Oct 04, 2020 4:39 pm

I used the old one to make a copy out of 4mil plastic. I then cut paper to covert he plastic leaving 1 inch exposed. I then use a spray glue and let it dry. Once dry i applied it to the door.

Sun Oct 04, 2020 5:02 pm

I simply use scotch tape around the edge to keep the vapor barrier in place. Never had a problem with it.

KTPhil wrote: Many tuck the very bottom INSIDE the door, so that any water making it that far doesn't get to the bottom of the edge of the masonite door card.
I do this as well. It guides any water into the bottom of the door and out the drain holes.
Like here in my Ghia ↓

Sun Oct 04, 2020 7:00 pm

Many (most?) car manufacturers use double backed adhesive clear tape to hold the barrier- so that's what I use exclusively. Start with couple rolls of the yellow plaid 3M tape.

Foam tape is needlessly thick and retains moisture. Don't do that.

Glue is needlessly messy and hard to work with. And overkill

Butyl tape that you see often in Japanese cars (the thin black bead stuff) is needlessly overkill and designed for people who like the petroleum smell and maybe 3M Scotch tape eludes them.

Sun Oct 04, 2020 7:07 pm

I used black caulk. I use 100% silicone and put a thin bead along the edge. Wait a couple of minutes and press the barrier onto it. The beauty is, if you need to remove the barrier, the silicone bead just peels off.

Mon Oct 05, 2020 5:23 am

I use ordinary thickness double sided tape, shaping the barrier so it tucks into the door is a neat tip I'll try that next time

Mon Oct 05, 2020 5:43 am

Most auto manufacturers use Strip Calk as the vapor barrier adhesive as do I..

Seals, stays pliable and can be reused.

Mon Oct 05, 2020 1:06 pm

Sharp64 wrote: I used black caulk. I use 100% silicone and put a thin bead along the edge. Wait a couple of minutes and press the barrier onto it. The beauty is, if you need to remove the barrier, the silicone bead just peels off.

x2 or even clear 100% silicon

Tue Oct 06, 2020 4:53 pm

I used butyl tape in mine. I like the smell.

Tue Oct 06, 2020 6:04 pm

I reckon the best stuff to use would be the sticky glue spot that comes when they send you a new credit card. That is the stuff that sticks the card to the letter. Sticks well and peels off relatively easily.

Not sure where to get it though.

Wed Oct 07, 2020 6:49 am

google sticky dots...other brands are available

Wed Oct 07, 2020 7:40 am

VOLKSWAGNUT wrote: Most auto manufacturers use Strip Calk as the vapor barrier adhesive as do I..

Seals, stays pliable and can be reused.

That's what I use, here's the link to what I use..
https://www.amazon.com/3M-08578-Black-Strip-Calk/d...amp;sr=8-2

Wed Oct 07, 2020 8:18 am

viiking wrote: I reckon the best stuff to use would be the sticky glue spot that comes when they send you a new credit card. That is the stuff that sticks the card to the letter. Sticks well and peels off relatively easily.

Not sure where to get it though.

Rubber cement would be my guess. Any office supply place.

Wed Oct 07, 2020 5:51 pm

I paint the masonite back of the door cards with clear varnish to stop the water penetrating but you could use any oil based paint.

Wed Oct 07, 2020 6:48 pm

^^^ x2

Or you can use some fibreglass resin (without the glass).

Wed Oct 07, 2020 7:07 pm

I have used everything from duct tape, double sided tape, packing tape and wood weld to hold the vapor on. My favorite is packing tape since it doesn't seem to leave a residue film.