Filling a drilled chainstay bridge

Just picked up a cheapish 531 track frame to restore and the rear chainstay bridge is drilled for a brake. The fork isn't. Anyway, looks like it's all going to get painted - how can I fill the hole without the ghost of it returning under the new paint? Should I just put in a new chainstay? Thanks...

i did something similar - if the frame's being hand sprayed (not powder coated) then car body repair filler should do the job. couple of applications sanding between each application.

something like this...

http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_167503_langId_-1_categoryId_165625

won't that crack and fall out? frame flex and mild corrosion and filler falls off?

if you don't have anyone to braze/weld a pile of filler in there, a tight fitting bolt that goes all the way through, then cut and grind it back down until flush would be my best suggestion.

if you cant get it filled with brass use JB Weld it wont shrink or crack and can be sanded down flush

filler may well crack/drop out (it didn't on the frame I did the fill on) but I imagine it ain't worth paying someone to braze a cheapo frame unless you know someone or know how to do it yourself, otherwise you may as well buy a new frame IMHO. It's a cheap solution to a fairly unimportant aesthetic issue.

wouldn't recommend using filler anywhere else on the bike though mind!