There is the fact that if your fiting the sideskirts to a base model car then you wont have the studs, so no need for those easy clips, just the sicky tape and screws underneath will be enough to hold them on.thats great but i take it this is a guide for retro fitting as the standard fit has little pop on clips on the wing and along the cill.
And they are a *edited for good taste* knightmare to clip on.
The best method for fixing them on is to use a high strengh sealent and G clamp the sill on for a few hours.
The silcoflex body tape is next to useless.
I forget the name of the sealer but its the stuff manufactuars use to bond roof panels etc.
You can get it from good motor factors.
Once it has stuck those skirts are going nowhere.
Where can you buy that stuff, even google has not heard of it?
Which product of teroson did you use out of the three?