MS Polymer Sealant/Adhesive selection
Hello:
I am writing to first say thank you. I really appreciate all the effort and energy you put into testing products and making videos recording the results. I found them very interesting and often think about conducting tests on products like that myself.
So, onto my questions.
Do you have a master list of the various products you have tested with the results of each...such as which ones passed, which failed, characteristics (such as viscosity or other) you encountered when working with the products in various environments and specified locations after or when you tested them?
If so is that information you are willing to share?
My next question is on the use of each and if they are usable for all waterproofing locations and situations in shower systems. Such as would I use the same MS Polymer to seal overlapping membranes together as well as around the base of the backer board wall where there is a 1/4" gap between the backer board and the rim of the tub...and them go over that with the liquid waterproofing and KERDI band or other? I saw that some liquid systems have bands that they install as they are applying the layers of waterproofing but other times I see the bands being installed with thin-set and other times as you did in your testing videos of those adhesives. And then also around the pipe protrusions for the shower head, valve, and tub spout? I did purchase the KERDI valve membrane with the ring and ones for the 3/4" pipe as well. But if I am not using the membrane back on the walls my thought was to use the liquid waterproofing membrane that can seal right up to and onto the pipe. However, I think I should seal it with sealant first and install it with sealant and then use the liquid membrane over top of them for extra protection around those protrusions.
I tired to attach a picture but for some reason cannot seem to do that from my iPad.
Thank You,
Jillian


I like the Rapid Set Non-Sag sealant available from Home Depot. Has good viscosity and extended set time.
I recommend using modified thinset to adhere layers of sheet membrane and bands. Then, a coat of liquid waterproofing over it.
The problem with using sealant to adhere sheet membrane components (other than securing to a tub flange) is that the sealant moves too much when trying to overlap the bands, causing pinholes that can leak.
Thinset grips the band very nicely, and liquid water can be easily applied after the thinset dries.