Style chooser

last week i brought nissan b13 spoiler (look like gsr).. then send it to paint n install on my wira sedan..
just now i realise that the spoiler's hole leaking n im afraid it soon will rusted... so wats should i do now? is there any workshop can solve my problem? or any diy thing i can do? need advice from otai2 here... since i dont want my rear bonnet will soon become pond hihihi..