We use mr tuffy tire liners and they've been great. Far fewer punctures. Downside is i'm really slow at replacing a tube I had to do my back wheel yesterday (pump got stuck on the valve and DH pulled the valve out of the tube getting the pump off ). But i insisted on changing it myself cos i know one day i'll have to do that on the road. Took me 45 minutes

I think i like the sound of that fix-a-flat gooey stuff