Hi, any ideas why does the lacquer on my body not check? I used Boston brand nitro, they advertise that it yellows, cracks and checks. I have left the body outside in -15C for hours, took it inside and heated it in oven, back to outside for hours...multiple times. I also tried the hair dryer + compressed air method multiple times. I have been doing these rapid temperature changes now for two days...and the body has zero checking. Thanks in advance.