For those who don't know (although it is painstakingly obvious), the purpose of the spray is to keep your makeup in place through anything that may usually affect the durability of your makeup! I have not worn foundation in quite a while so I am unsure on how well it holds that in place however I would imagine the effects would be the same :)
I bought a travel bottle as it was only £9.99 (the big bottle is around £30) just to test whether or not I like it. Before spending a lot of money on something I like to test whether it is actually worth the money!
ANYWAYYYY, I'd 100% recommend if you have issues with keeping makeup on for long periods without any touch ups! It also makes your skin look super satin-y and nice!