lol I used to make at least 4 molds before I got one right
just remember that spray foam expands with alot of pressure... so very little is needed
I was help'n a buddy put in a window in his adac and he got some spray foam for around the window... neither of us had ever used it so we sprayed alot to fill it up... it started spilling out but we cleaned it up... 2 mins later... the window went fly'n out, and down 3 stories down to the ground... crazy shit.