The green tape is just masking to confine the areas. Personally I don't use masking tape as a general rule, I use plastic tape of various types. If masking tape is not removed before the epoxy hardens it will be a bugger to get off and will get bonded around the edges. Epoxy is the only way to go. There is absolutely no use for "fibreglass resin" or the proper name polyester resin. Useless crap that is only useful for making cheap boats and some Corvettes, the cars that is.