The company we got our mats from also sold an adhesive and a sealant. Could be an idea to ask the people you have got yours from. Or PM me and I will tell you who we got ours off.
As a freelance instructor myself who has worked on many livery yards. I find this behaviour terrible. I certainly think she is trying to recuit you - had a similar thing happen to myself years ago. Was competing at a particular venue and the owner was a dressage instructor (quite well...
We have dealt with Bearts of Stowbridge, they have varying different models of trailer and gave us brilliant service sorting out which trailer our car could tow and which ones suited our horses too. Would really recommend them to anyone.
I have flexi-ride and have to say it has been the best surface I have come across. Minimal maintenance and gives good return. I have no membrane and just the flexi-ride - no sand as I have seen far too many areans where the top surface mixes with the sand and causes a lot of problems. Weather...
Many years ago I was warming up at a show and Tim Stockdale lost control of his horse and it nearly knocked me and my pony flying, he was very apologetic and after he had completed his round he came over and helped me warm up!!