Mechanically prepare the existing concrete surface by scabbling, needle gun, mechanical disc grinding. C o a t e d s u r f a c e s C l e a n, d r y a n d u n d a m a g e d c o m p a t i b l e coating (ISO 12944-4 6.1) Clean, dry and un damaged compatibl e coating (ISO 12944-4 6.1) C o n c r e t e M i n i m u m 4 w e e k s c u r i n g. Abrasive swept or alternatively blasted to Sa 2 (ISO 8501-1) of at least 70 % of the surface.

S h o p p r i m e d s t e e l D r y, c l e a n a n d a p p r o v e d i n o r g a n i c zinc shopprimer. Abrasive blast cleaning to achieve a surface profile using approved non- metallic abrasive media which is suitable to achieve a sharp and angular surface profile.

A l u m i n i u m T h e s u r f a c e s h a l l b e h a n d o r m a c h i n e abraded with non-metallic abrasives or bonded fibre machine or hand abrasive pads to impart a scratch pattern to the surface and to remove all polish from the surface. Light brush blasting using non- metallic abrasive leaving a clean, rough and even pattern. St 2 (ISO 8501-1) C a r b o n s t e e l S a 2 ½ ( I S O 8 5 0 1 - 1 ) G a l v a n i s e d s t e e l T h e s u r f a c e s h a l l b e c l e a n, d r y a n d appear with a rough and dull profile.

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