Advice on repair.

Any advice would be welcome. I got out to the boat recently after being away for a awhile and found this damage to hull/deck joint or toe rail . Having considered the job I think it is beyond my level of expertise. Can anybody suggest how I might put a temporay fix inplace that could be reworked by a shipwright later to effect a propoer repiar. My thought was to sand the egdes and lay a couple of layers of glass matt over the damage to seal it and then that could be sanded away easily leaving all of the substraight inplace so the shipwright could then sand to the required depth and lay new glass, resin and gell coat to effect a proper repair. I would probably need the temporary repair to last for six months.
Thanks