the thing is bro, make it as strong as possible before bondo... so tape the ____ out of the inside
I used bondo glass like Ord'ika said but its cost be around 50-60 bucks so far (bondo-glass, spot puddy, extra hardener, etc) And i dont have any left :/ so depends on what you have for cash
Im feeling like a pro already
(but im definatly not
)