Sadly, many tutorials show E-6000. Mainly b/c it dries clear and isn’t as noticeable. Most do not do the research and only care about shooting out another You Tube or blog post to benefit their website or You Tube Channel. I discovered early on the discussions makers were having b/c their crafts were coming apart. There’s a huge difference between a “glue” and a caulk. E-6000 is a good craft glue for an INDOOR project. It’s just not intended to hold up to high temperatures. I have since researched the heat-rating for several products in order to help readers have success with their outdoor garden art b/c I hate to see someone give up out of frustration. 🙂

E-6000 is thin, runny and stringy. You have to either prop it tip end up when using it or put the cap back on. It you just set it on its side the product may continue to run out on its own. Other glues can do this as well. When I use E-6000, I always wipe the tip and prop it so the glue tip is in an upward position.

Not heard of B7000, but for outdoor use, you always want to look at temperature. All glues are rated for such. Super quick research on B7000 shows 90-C which equates to 194-F, so about 200. That is still a very low heat threshold (though better than E-6000). Some 2 part Epoxy’s are rated at 200. As mentioned in the article, it would depend on where you live and your summer temperatures. If you have prolonged heat, I’d stick with the silicone calk products. They are intended to caulk around the exterior of doors and windows. But you could certainly experiment and discover what works best for you.

As for the mosaic: are you mounting it on the door, or replacing existing glass with your mosaic panel? I do not have enough experience to confidently advise here. I would talk to a contractor or someone in your community that sells glass or works with glass arts. I have heard about those who have used thick glass platters for a transom or green house windows- that the glass is often thicker than the glass panes for standard windows. Many entry doors have glass panels in them that aren’t bothered by ‘vibrations’, so my guess is that if the panel was secure top and bottom and sides…so it’s not swinging loose, it’s probably going to be ok.

I love making garden art, and love being able to help others by sharing knowledge and experience. When I come up against a problem or something doesn’t work out, I attempt to find out why. I also keep an ear out for problems folks experience and in the process, I’ve learned quite a bit as well!

Sounds like a great project. I love spools! But I’ve not worked with cement board before. I do know that crafters who do mosaic…even mosaic on glass or mirror surfaces or on wood use silicone. But it’s a different form of silicone. I think it’s clearer and thinner than the standard stuff in a tube. You might want to inquire at the hardware store. Perhaps checking at your local art glass store or a glass dealer? I’m thinking some type of silicone product for its excellent outdoor qualities.