But if you delve into this procedure, then the whole difficulty will immediately understand. Firstly, when gluing, the indicator of the viability of the glue is very important, that is, that time for which it will not be unusable, being applied to the surface. In this case, this indicator cannot be absolutely positive or negative, since in some cases, rapid captivity is needed, and in some. Secondly, surface preparation is very important. The result of gluing largely depends on the level of training. This issue can be considered by the example of the same rubber ball.