The secret Ash is to just put a bit too much into the joint then spray it down with a diluted mix of fairy liquid & then come up or down the join with the Silicon tool & put excess onto a paper towel or wonder wipe.
With a bit of practice you will be surprised how good a finish you can achieve.
I gave my away stef to someone on here, posted it meself, not even a thankyou !
Im pretty good with my finger ...................mmmm theres a joke somewhere in that comment 😉