Tubs

I need a spare tub for an epic sportive. A mate has a veloflex carbon that is pretty New, but has been repaired With sealant. It has quite a big cut which I could probably glue. He also has a Schwalbe one, which was repaired With sealant, but was ridden a little while flat so has some side wall damage (which leaked sealant apparantly). The hole in this one is tiny.

I'm going to pump both up and see that they hold air. Then take the one that holds air best. If both are fully Sealed, I'll take the glued veloflex.

Is my thinking sound?
Is a tub With sealant in a bad idea for a spare?

It's probably a slightly bad idea as you don't know if they will work when rolled on. Big cuts that have been repaired with sealent are likely to spew out again when riding. It happened to me at the furthest point from home it could be once :(. The schwalbe one sounds like it will be alright though.

I'm moving away from tubs and have some spare stuff. If memory serves me correct, I have a brand new gp4000 tub and also a slightly used, but punctured, but professional repaired by Pete Burgin (RIP) corsa cx tyre that is all nicely wrapped in a sandwich bag all ready for spare tub use. If either of these interest you, send me PM.