Personally, I would probably not use Sikaflex or any other adhesive if using a roof rack was an alternative. The reason being that once you have applied the adhesive it is there for good pretty well - not a problem until you come to sell the van or a solar panel goes down - now which one has gone down ......
With a roof rack you can transfer the panel and charging system to a new van easily, checking out panels is a doddle.
On the other hand there is more wind resistance with a roof rack but the airstream will be disturbed even with panels stuck down. Like many things in life there are compromises. If you were to get a roof rack then you could fit a couple of 300W panels as easily as (and they are more robust than) the thin flexible panels. Swings and roundabouts.
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