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You could use that knife, but it’s not really the right tool for the job. If you can’t get a special craft knife, medical scalpels also work very well and art shops tend to stock them, and being re-purposed medical equipment they’re cheap. A good pair of snips is also worthwhile too. After trimming the nub, a bit of good sandpaper goes a long way to cleaning up real nice though.

X-acto knives are like a dollar a piece. Don’t know about refills on the thing but it’s hella cheap. I just bought a full set in a dollar store (well not exactly a dollar store but an equivalent)(foreigner alert) for about dollar fifty. It’s not that great and feels cheap but it’s better than a box cutter. Also it comes with a magnet. So wooo. I am entertained easily.

You may find at that temperature, you will get some blotching/mottling. I too live in a cold climate and have issues with clear coating. Warm the can up in warm water (not hot!) and if you can spray indoors eg in the laundry or bathroom, it will make a difference (clear coat should be OK inside). If you have to spray outside, check it first on the runner (paint the runner as well) to see if it will mottle. If it doesn’t, you should be OK to go. If not, you will have to sand and spray again! Id suggest maybe investing in a spray booth which may make things easier so at least you can spray indoors!