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There is only one known way to rid the crazing or spider cracks that I have heard of and that is to completely remove them. Some cracks can be removed a dremel tool and sand through the gel as spiders do not go past that point unless they are stress cracks. I too had an extreme amount of spider cracks inside and out. I used an angle grinder and 80 grit to the inside along with an orbital sander and finally the hard to get cracks with the dremel. On the bottom I didn't worry so much I just removed the cracks on the sides. I did a limited restoration 15 years ago and tried 2 different professional grade products on the spiders cracks which did not work. If you plan to use the boat this season use it and mean while get a plain and do a lot of reading and research then you'll a more confident approach to the project and also some decision will become a lot easier. Whatever you choose to do in the rehab of the boat, make it fun and the boat a boat that will be functional for your use despite what you may hear from purist.
As far as water intrusion double check all drain tubes especially bow locker. I found that I didn't have any in the bow locker and the stern were rotted, those two areas were my number one source of water intrusion. Other than that check all cracked up areas to make sure they are not impact damage and in need of moderate repair.
Oh' by the way Welcome aboard and it appears that your hull ,from the above posted link, is a 1964.