@YnotDIY
I have used to cheapo blue paper gaskets in the past, and had no problems, just wipe the surfaces clean, torque to tightness feel by hand with a 1/4 ratchet. (i think it's only 12 ft/lbs but don't quote me on that)
Then check the seal with spray...but i did replace with a set of beck arnley (or whatever the generic german brand is, Victor reinz?) black ones in a week so I never tested the cheapies long term.
I like to keep my engine squeaky clean so i keep a can of brake cleaner lol!
The thing about the cheap ones is that if you don't get them on evenly the first time, you might as well throw it in the trash. Just my experience. I don't see why a gasket sealer won't work.
However, it's well documented on why oe quality is more critical in Subarus when it comes to gaskets, spark plugs and wires, etc...picky little turds, haha!
Happy wrenching man!
Oh one last thing, this was on an ej22, but I don't see why the same would not apply to an ea.