Can a rusted unibody floorpan be reinforced with fibergl?

i have an 82 camaro and the seam on the floor pan behind the driverside front seat and the seam along the rocker panel are rusted pretty bad and there is two spots about 4 to 5 inches in diameter, one up by the pedals and one right in front of the seat that have pretty much rusted through. other than that, everything else on the pan is solid without any rust. i dont know anything about welding in a new floorpan and money options are limited. a friend said to cut out the rust and use fibergl to repair the rusted sections since the majority of the floorpan is still solid. being that this would pretty much mean cutting out the two seams will this leave a solid enough foundation for the seat and would it be a safe alternative to trying to replace the entire left hand floor pan. everything else under the car is solid and the seat seems to still be sturdy(doesnt rock back and forth or seem loose) or feel like its going to go through the floor and id like to keep it that way. any advice would be greatly appreciated.