Roof rust where windshield meets and dots on roof

What are my options with this? One mechanic who isn't a body shop told me I'll need to replace the roof panel and it will cost thousands to fix.

I sort of want to hear some Prius owner opinions on this now, if I can't stop it can I slow it? What fixes/hacks/etc have you guys used before?

 

I'm in South Florida but I just "bought" the car about a week ago so I'm not about it's previous maintenance but inside is very clean. I'm within the time frame to return the car (it's carmax) but really like it and want to avoid doing that if I can but at the same time I'm hearing stories of it rusting out quick and letting water come in. Just wondering if there are options that make sense besides returning the car and continuing my hunt.

 

This thing stumped 2 master mechanics and everyone I've showed it to.. One said he did Body work for 30 years and wouldn't touch it. I didn't like my odds so brought it back to Carmax and going to figure out what I'm going to do while they figure out what they are going to do. Maybe get the down payment back and just get an older Prius and run it into the ground but I seriously liked this one. Maybe look for another 2015 but study the hell out of what to look for in rust before even getting into it to avoid the paperwork and hassle of needing to bring it back if it passes with flying colors (like this one did at 2 PPIs, both recommended on this forum).

I seriously doubt they will fix it correctly but you never know, once they call me and tell me to come down/come get it I'm going to bring it to a few body shops for an inspection and find out if whatever they do will at least buy me a few years. Wish me luck.

 

Breaks my heart to hear that. Here are some picture of the undercarriage and other parts from the PPI. Any hope?