I'm using PPG dcc single stage paint. Double checked, and also verified every time before mixing, it is 2 reducer, 1 hardener. I talked to the person at the ppg store when returning the fish eye eliminator. She said I could ad reducer up to 10%, which isn't much. She said Its better off just laying it on thick and sanding the orange peel than to go too much reducer. And the reducer is 75 degrees to 95 degrees. I am in range. I was just thinking that the humidity levels might have a play in that too.