How do i build a small concrete sprayer that i can use to spray the inside of a `outer` roughage cup mould.?

Do it yourself assistance for flooding vault?
Answers:    dwow, I had to assume about your / for a minute. The best proposal I can give you is to not try to "buil one", instead be in motion down to casa depot and buy a cheap hudson sprayer, that is used to spray weed killer's and such. Should just cost about $10.00 - $14.00 dollars. biddable luck
Telescoping tubing?...?
depends on the size of your mold... but the Monolithic Dome people surrounded by Italy, TX have shotcrete sprayers on their website that they use to manufacture dome buildings
What's the type of screwdriver specifically used to...