I tried it today on the rear LH wing
This is an easy job as these parts have been stripped most recently - the paint is the thinnest (not like the sedimentary layers on the doors)
Much like the PORstrip there is a visible reaction within the first 15 mins
After three coats and a fair amount of scraping with the stripping knife I got it to be this good =>
I think it is about as effective as PORstrip would have been on this part
The fumes are low like PORstrip too
There is a massive difference in performance however - with the PORstrip you can be quite relaxed. Once the paint is gone you don't need to get a sweat on removing it from the bare metal. With synstrip you do.
Washing in water isn't enough - you get a light rust (perhaps rust-like) thing going on
This isn't a massive problem so long as you can get to the paint stripper - think inside doors or spot welded parts for example - not very nice.
Still with water and detergent it comes off alright