You don't half talk some nonsense. You can't put foam in an open lateral hole - it runs out.
maybe I am stupid but have some experience and ideas so pls stop nasty comments and try to use your brain as well
take a look on the drawing and scan of label from expanding foam
hole in this size will be easy filled with cheapest foam for £6 (500ml) to prevent from running out- any kind of old board can be used- so doesn't cost anything
Salute