Thanks, If I do try tubeless again it will probably be Pro Ones in 28mm. I'll have a look at the Effetto sealant, i've heard good things about Orange Seal...
Orange Seal is all we use in the shop for personal bikes. I've been running it under some Compass Cycles tyres for a few months now, and under some Vittoria Barzos for a few years now.
Ive not had a single puncture on my Pro Ones, the 25mm come up as 27/28mm though.
Effetto Mariposa is a good sealant, I had a massive hole in my Corsa Speeds from a screw and it sealed it.