rusty rear arches

[carmadaaron]

my mk4's rear arches are rusty and has failed its MOT.
basically it had sharp edges and i think it failed for that reason.

im new to this rust stuff, and i need some help.

what do i need to fill the holes/bits broken off the arches and to make them smooth again? is it body filler? what kinds do they come in? im planning to do this DIY, repairing it then painting it.

cheers

[polo boi]

ok mate, dont panic, ive did this b4 but is was 2 my dads laguna an it had 2 pass a psv which it did afta my brill bodywork, ok wot u need is, a grinder, sand paper, try an get different grains as u will need them, u can buy packs in halfords perfect 4 the job, also the paint, isapone(bodyfiller) if the hole is big u may also need fibre glass resin an mabye mesh(only mesh if its a big gap) oh an primer coz u need 2 grind right down until its chrome again an prime it b4 sprayin, an wet an dry sand paper. arches are easy 2do, 1 full day would get it done perfect, make sure its in a warm condition wen ur sprayin an wen ur sandin an grindin try an do it away from where u will b sprayin as u dont want dust lyin on ur good job an ruining it, if u have heat panels 2 dry the paint that wud b perfect, but thats all u need there, just take ur time!! coz u dnt want it looking shabby hope ive helped ya

[carmadaaron]

thanks for your response,

hole is about 5cm in diameter

what do i sand down, the bodyfiller or that fibre glass resin?

cheers again!