You want to take epoxy resin and mix it with a filler to fill the gap. There are many different formulas but I use Epoxy and West System 406 for my glue and fillets. I use micro balloons and Aerosil for fairing.
The epoxy glue will be the thickness of peanut butter, spread it on the stringer and put them in place. Then use the epoxy to make a fillet along the side of the stringer.
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