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
@jozza started
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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