Hi all, I recently did the course. To practice i then did my own nails perfectly. However a few days later fortunately it was my mum!, the brush in the base/topcoat went hard and on the nails seemed gritty! I put a brush from a new bottle in and surprisingly the same thing happened!,,, did I, 1. Have the bottle too close to led lamp when doing my own nails, or 2, was the fast bond not dry! Can anyone please help?