I know a lot of scrollers here would use a #3 for something like that, but I use a #1 for 95% of all my cutting, sometimes I go up tp a #2 blade but not often. I know it means slower cutting, but I feel more comfortable with those sizes of blades, and I believe you should use something you are comfortable with. Try it with the smallest blade you have, if you don't like it you can always go up a blade size or two.