welcome!
Are you wanting to cut card stock and thinking of protecting it with a label?
No need. There are many of us who’ve done card stock without any masking. Just start with low power and “sneak up” on the settings (for either etching or cutting) to get what works. I don’t have my notes in front of me, but i think I used about 30-40 power and full speed and had no sign of burning on my cuts–but that will vary based on the stock you’re using. I did a little extra cutting besides just a business card, but there are others who’ve done very detailed paper cutting work…
But pin it down well–never enough magnets (I often set it up, let it get scanned and move the magnets as needed to ensure have the best pinning and out of any cutting/etching paths. And do keep an eye on it, in case of flare ups. And if you’re doing etching and cutting, always etch first, in case a cut out piece blows over the top of the sheet & covers areas being etched, or causes your entire piece to shift… been there, done that.