The aperature tape as it is called is pricey and still leaves a fuzzy edge. Use the 3m green or yellow tape to do your outlining. The blue stuff won't stay on for the duration of the paint job before it starts to come loose or curl up. The paint store will usually cough up some sticks and strainers if you ask. I usually get a pint can also and pour maybe 1/2 pint uncatalyzed into it to save as touch up. there are different ways to do jambs. I use fineline sometimes or tape at the first break.