The website is a bit rubbish but this firm are the best in Land Rover circles, so if their special formula which is reported to be better than waxoyl can stop an old Land Rover from rusting then a Porsche should be no problem! They clean and then thoroughly underseal after treating or repairing any rust areas.
Alternatively you can rent a ramp at Ramp-it-up which have centres all over, one in Arbroath is closest to me, and do the job yourself if you feel confident.
Don't write off Waxoyl!. Ive used this stuff for years and coupled with Dynax S50 injected into chassis members is as good as Dinitrol IMO. Ive done Jaguars, Fords and the Porsche is having the same treatment as we speak. You are right that it is wise to re-apply every couple of years (especially the underside of the cars), but the Porsche's are protected even further by the addition of the aerodynamic undershields which means that you could extend the re-application by another year or so.
Dinitrol is good, there is no doubting that but again be aware that holes are not drilled to aid the application of this stuff. Any reputable firm will use existing holes in bodywork and chassis to access areas using extension lances and flexible application tubes to get to hard to reach areas.
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