More important than drilling and filling them is to determine why they developed int he first place. Spider cracks are there for a reason, if the gel is too thick, they will appear again after the "fix". The cracks in the gel acts as relieves of the rigid surface so new cracks are not developing but once you get the surface solid again, they are likely to reappear if the reason for them is that the gel is too thick.
One other reason I can think of, specially that they all appear to originate around deck fittings, is that there was no counter sinking done for the holes of the fittings screws.
In any event, this is an involved repair, fixing the cracks by drilling/filling them one by one is not what I would do for the reasons I mentioned above and also for the color matching issues that will develop in the future. What I would do is to grind down to fiberglass and re-gel but like I said this is a task require some skills.
Check with your insurance if this will be covered under your comprehensive and get quotes from good repair shops. best of luck to you
