I recently used Meguires auto compound on a buffing pad (on a random orbit sander) to polish shellac, which had been sprayed, and cured for 3 weeks. The polish initially looked fantastic and I could see myself in the surface, but a half hour later, the surface turned completely cloudy and white when the solvents evaporated. When I applied mineral spirtits the perfect surface returned. I tried scrubbing off some imagined residue with a rag with mineral spirits, but every time they evaporated, same problem. What is wrong? I had to sand off the surface, and start again. Thanks for the help. I like motorized buffing, and get a better surface than rubbing by hand with rottenstone. I had purposely tinted the Meguires with Japan color to prevent any residue from leaving a white color in a crevice or uinfilled pore here or there. Could that have changed the compound?