If you have and want to patch/ seal a cracked glass or you want to make anything from scratch where u seal the glassses together this is what you need.
Silicon is used for alot sealing things also to seal or patch glass: and because it dries fast it is idyl to seal/ patch aqaurium glasses. The gun helps to press the silicon out skillfully. Optionally without the gun you have to really really force the silicon out from the container which might make the user spill more than enough silicon than needed. It is not just better to use silicon without the gun for a neat job.
Silicon come in different color like white, black but this is a clear/ transparent silicon, ideal for glass uses. Beacause one can likely see through this silicon gel and dosnt appear as obvious as other silicon would on glass