nope you just fiberglass the inside and put several coats of aqua resin (with out fiberglass) on the inside, and if you want to smooth parts of your armor with the aqua resin just mix it with a higher powder to liquid ratio. if you fiberglass the outside it will actually ruin the details and you wont be able to sand it. if you have any other questions feel free to ask
(and dont worry, everyone asks noob questions at first)