It's been a while...
For those following GrantC's rust thread, I'll just dump all the pics of the rust repair. The bodyshop I went to is called Artisan Autobody, the guy and his wife there are
super nice. Found them from 1 review on Beyond.ca, surprisingly. TL;DR, no welding, new metal adhered into place, hit with primer,
sealed with a 3M product he mentioned that I don't recall the name of, then undercoated.
Warning, if rust makes you queasy, scroll past now...
The water will come in thru the hole on the right near the C/D pillar. There literally is just a hole that gets covered with undercoating. There are holes like this near the rear of the wheelhouse behind the strut (looking across the axle line) WHAT THE uckfay SUBARU.
Note; I did visit the shop and yes, they cleaned away the rust before covering it with new metal.
Now onto the wheelhouse
Passenger side had the same symptoms, around the filler neck area too.
After picking up the car, on the passenger side wheelhouse, I caught a bubble that was super small before putting the interior together. Sanded and painted it. I must have missed it but it's all done now, I can't really tear into it. YOLO.
WHEW I'm glad that saga's over. Interior's all bolted in, thank you for the help 05LGT. Feels like a Lexus now. Only a few hiccups, I have a chewy thread on one of the lower seat bolts for the seat squab. Will chase it later this week.
Onto more happy news, I'm still super thankful for everyone who pitched in and got me YvanF's coilovers, you're all wonderful, thoughtful people.
<3<3<3
To complement the coilovers, with Black Friday deals going on, I ordered Whiteline's KCA335, Com-C front top hats. Cheaper and less NVH than camber plates (which honestly, to get mucho caster, would be $$$) which brings me to the next thought. I'm waffling between how much I spend to prep the car for autoX... do I just join the arms race and buy everything in the Whiteline catalog to get faster at autoX? I need seat time, and I want my money to go elsewhere as well.
_edit_
In looking through the pictures, no matter how much you chase rust, GG wagons man, not even once. I
love my WRX, it's brought me so much in terms of friendships and experiences, but holy itshay. I should have just bought an STi lol.