Sure is. Try using the Tamiya masking tape; it's a lot more expensive than normal decorator's masking tape, but allows a very tight seal and fine edge, is low tack, so won't damage the paintwork, and is well worth the extra expense. Most places sell it in 6mm, 10mm and 18mm dispensers, but Model Hobbies now have the 'refills' at half the price - around £2 for a 10mm roll.