I have read that to help the paint adhere to the bulb, you have to clean it first with rubbing alcohol. I did that and gave the bulbs their first coat of paint. I waited about 48 hours before applying the 2nd coat. When I was applying the 2nd coat, the first coat started coming off. I am using a 1" wide sponge brush, if that matters. The only way I know to keep the paint on is if I use a primer on the bulb first (no rubbing alcohol). Am I the only person that has this problem?