Simon Wright

Sorry to revive this thread , but for those that have used epotec 408...... i spray a few pots of it on a shell the other day and got 3 results....some sections came up a dull powdery finish and hardened up nicely. another very shiny smooth but hardened up nicely, and the third which after a week is still tacky.... possibly explanations?? thnaks in advance, obviously i haven't done this before and believe i have mixed correctly. 4:1