Some do, some don't. The ones that are supposed to create a vapor barrier will usually have an odor because this type of adhesive is created with other materials besides just the glue's contents which could confuse people who are sensitive or allergic to certain chemicals. If you can find one without any odors, then it would be best to choose those instead - and they often come out on top as winners when comparing prices too! The most common problem with spray adhesives happens during application time, where surfaces need cleaning before use. If not done correctly, these glues won't easily adhere and may leave behind residue after drying. Dust particles will become embedded into the surface rather than being left outside or on top. The solution is to use a tack cloth or any cleaning rag that has been sprayed with the correct cleaner before application time begins so there isn't anything left behind on top which could cause problems later - in fact. It's recommended for just about every project, whether you're doing something as big as painting walls, installing tile, or constructing shelves because these types of materials can often leave scratches if not protected properly during their installation period, and this includes taking care of them afterward too. Some people like using tape but be aware: adhesive will still need to touch the surface even after paper masking tape has already been used.