I am going to restore my 1960's 14ft Glasspar Lido runabout. It has some spider cracks around bolted areas as well as on each of the top sides caused by being stepped on. How do I go about fixing this? I am thinking of opening the cracks with a dremel. Filling them with Marine-Tex and then sanding. Will this work? Also can I use Marine-Tex to fill in holes caused my drilling? Any help would be greatly appreciated. Thanks inadvance.