Buzz
Water-based glues may not provide the strongest bond, but they are a convenient option when working with kids. FreshSplash / Getty ImagesChances are, you've been using white glue since childhood. Elmer's glue is a widely-used adhesive in school arts and crafts projects. Most glues like Elmer's are polyvinyl acetates (PVAs), which don't create as strong of a bond as other types of adhesives, a helpful feature when you're prone to accidents or mistakes. One great advantage of these water-soluble glues is that you can thin them with a little water for a smooth, even coating. This diluted white glue is especially favored by hobbyists creating scenery for model railroads.
One reason white glue is so popular for these tasks is due to how it works. Typically, glue works in one of two ways: either it seeps into porous materials and dries to 'knit' them together, or it causes a chemical reaction that bonds molecules. White glue fits into the first category, which is why it doesn't perform as well on smooth surfaces but excels at bonding wood, paper, and fabric [source: Carter].
If you're planning to use white glue for a modeling project but want to avoid an uneven surface or glue spilling between areas, spraying it on is a great way to achieve a smooth and uniform application. To do this, you'll need to dilute the glue with water. Some people also thin it for non-spray uses to create an even layer. Since there's no standard dilution ratio, hobbyists have their preferences for proportions. The goal is to create a liquid consistency that will spray easily. Some suggest mixing one part glue to four parts water, while others prefer a one-to-three ratio.
