Here are some links to get you started if you are interested.
https://pabblaster.com/?product_cat=pab-sandblasting-guns
Harbor Freight no longer lists their air eraser on their website, but this one is very similar.
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I’m curious to try the wet application method. Think I’ll check if there are any YouTube videos that show the process. Not sure how much dish soap/water is necessary to get a good slide, and then I assume you let it dry before cleaning the soap residue off. I had already ordered the squeegee @ekla posted by the time I saw your post. Thanks for the help! 
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I always wanted to try this too, which is why I bought the Air Erase from Harbor Freight! I tried it on a couple of glasses but that was all I ever messed with.
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So… unlike glass, acrylic scratches very easily. What about just using sandpaper over the stencil?
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That sounds like a great, super easy idea! I’ve got some experimenting to do this weekend! Thanks! 
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Let us know how it goes!
Will do!