One must first assess the material of the slide before advice is given. Mine was a question as sometimes you don't know and it is not uncommon for manufacturers to slightly mislead. I personally do not own any PSA slides so, again, it was a question.
Now that we have, hopefully, determined the slide is made of stainless. Yes, I would blast it, but I would use garnet as the sandblast media since it will leave the material cleaner and not contaminate the metal which could lead to rust. If you blast, I'd probably wipe it occasionally with a surface protectant.
How do you know that a Dagger slide is stainless when you own no PSA slides, yet I own 2 Daggers? That's like a nerd correcting a fighter pilot on a stat about the plane he flies. IDK, the slide never crossed me as SS. It sure isn't a quality, bare frame 1911, or revolver type of SS.
Here's the issues. 1) It may be classified as stainless, but it's likely some extremely cheap stainless. A magnet sticks right to it. Not the strongest hold, but it definitely grabs it and holds. At what point is stainless not allowed to be classified as stainless? 2) Have you ever seen PSA sell a bare Dagger slide? If they have, I haven't seen it, but just like I was apparently wrong about a Dagger slide being stainless I don't live on 2A focused sites 24/7 either so maybe they have I I'm just not in the know. With all the different finishes that PSA has offered over the years this signals to me that PSA must feel that they're sides wouldn't hold up too well being uncoated, and bare SS.
I've got bare 1911 frames that don't have a problem rusting/corroding, but they also don't stick to magnets either. I have an aftermarket SS 1911 magwell (from an extremely reputable company that if I put their name out there you'd likely call BS) that gives me fits with corrosion. I'm on my 3rd magwell from them as they pit and rust so bad, even when I oil them. When the stainless gun doesn't rust, but the aftermarket magwell does, and in very short order that says good SS, vs cheap SS. I'll look for a picture after I post this. For reasons like this stripping the Dagger slide is likely a bad idea. It's likely some cheap, Chinese sourced stainless that will corrode, but if you want to try it then knock yourself out.
I'm just struggling to figure all this out. A few weeks ago OP wants to upgrade his Dagger trigger with an aftermarket trigger. Now he feels the Dagger is just some ugly throwaway, trailgun that he only invested in because he wants to test mounting optics on it, but it's ugly, which he just can not haveñ regardless if it's just a test mule for optics, but he's unwilling to invest in getting a better looking finish added, so he want to spend the time/effort/money in getting the frame stripped of its OE finish, only to leave it bare? This all seem odd and a little misleading, or disingenuous to me.
EDIT: Colt SS frame/Ed Brown magwell, mainspring housing. Again, I've had Ed Brown send me 3 of these for rust/corrosion issues that not even being covered in thin oil would cure. This is after only 3-4 months on the gun. Gun frame, as well as the blued slide has 0 rust or corrosion.