These cars will not disintegrate if they get wet. The last time I checked, Porsches (and all sports/race cars) are raced in all conditions and on all types of surfaces
Fix your leaks and go enjoy your cars as intended!
I am of the variety who goes on drives (not just commutes) in all weather. Being from the PNW you don't get much of choice. Plus it is challenging...you have to change your driving style, braking zones etc. I find there is great joy in adding patina and experiences through automotive travel and I find it sad that there are some ridiculously shiny machines and people shackled by perfect paint and chrome.
All of these 'old' cars can be found scampering through hill and dale year round
