Yes I've got mintex ceratec and use it for pads etc. never thought to use it on cylinders, although last year when I serviced my sons VW polo I did use it on the cylinder that I needed to service as I couldn't lay my hands on the red stuff!. At the moment I'm trying ATE Bremszylinder-paste, on the rebuild I am just finishing in fact, this is the first time so I'll see how it goes but red rubber grease I'm sure is the problem, It seems all the time you are using the car it manages to stay fluid enough but as soon as you lay it up for winter it sets like toffee! Many swear by brake fluid as a lubricant on servicing a cylinder or installing a new one but I'm not a fan and don't find it promotes a good barrier seal, rather a fluid track for weeping. whereas a purpose made lubricant stays where put and also protects the outer aspect of the piston and seal behind the dust cover. Thinking I might just go back to petroleum jelly. easy to apply and allows the correct surface cover and I never had a problem with them seizing up in the winter lay off!
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