For my shelter, I started by cleaning up the surface where the fiberglass would be laid. In retrospect, I should have allowed for more overlap from the new glass to the original glass. I later stripped the whole tank before panting. I built up some rough cardboard with tape and hot glue.
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I then built up plaster and shaped it using rasps and sandpaper.
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I brought the plaster surface up to the same level as the original tank, then feathered the edges of the glass once I laid it. For a release, I used paste wax first, to fill the pores of the plaster, then a little vasoline cut with mineral spirits for a greasy barrier.
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At this point, it took a fair amount of Bondo to smooth this sucker out, since I wasn't the best at laying the glass.
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Primed with self-etching primer and good to go!
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