Plexiglass is an acrylic, and as such has several good solvents that will repair the cracks. I'd contact a sign supply company, like Hart Supply, in Hingham, Mass. and ask what acrylic solvents that have a filler they have available.
I wouldn't use a sealant on the Plexiglass itself. Many of the sealants, except for the silicones, will attack the Plexiglass themselves, due to their chemical composition. The silicones aren't really adhesive enough to work in this type of application IMHO.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.