"I use this frequently in my line of work and have found it to be very reliable. Make sure in colder weather you leave it in a reasonably warm room before use, otherwise it will thicken up due to the colder temperature."
"As 'hamster' states do not store this product in a cold place as it becomes unusable. The formulation must have been changed in recent times as I don't remember this being a problem with the product in the past. No mention of this issue on the tin, the datasheet or Evo Stik's website!"