I use extra thin cement for 90% of my plastic modeling needs, but sometimes I need an adhesive that is better for larger parts that gives me better coverage, dries more slowly so I have time to position the parts, and is still easy to use. For that I still have a tube of the old classic Testors plastic glue, but I tried this medium density cement from Ammo and I like it. It does a good job and is not quite as messy as the old tube glue. Like most extra thin cements, it comes in a glass bottle and has a brush integrated into the cap. So it is easy to just open the bottle and spread cement where you need it. Because it's thicker, it is great for large parts where you want to press the parts together and have the thicker glue automatically spread and create a larger contact area for adhesion. Even though it says slow dry though, I do sometimes still get small strands of this cement that form when pulling the brush away from the part, however the effect is not as pronounced as what I get when using the old tube glue, so it's ultimately less messy. While it's not a requirement to have a different density cement than extra thin, it is yet another tool in the modeler's toolbox that provides versatility for some situations.