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quiry13 (Structural) (OP)
25 Jul 01 13:06
We need to hydro blast steel prior to appling an epoxy primer. Do we need sand injection for adequate profile or will it stick to the steel with water blast only?  If sand injection is needed, what kind of grit, what size, and how much sand to use?
rembrandt (Specifier/Regulator)
4 Sep 01 4:05
It would be beneficial to apply your Epoxy Primer on a surface that has a profile, to give a mechanical 'Anchor' to the coating. As you quite rightly state, Hydroblasting
( Or U.H.P. Jetting) does require Abrasive Injection to produce a surface profile. The type of abrasive is crucial to give a profile of given shape and depth. We use GMA Garnet, Australian Grade, this is a naturally occurring hard and very dense Inert Mineral, crushed to the grades suitable for giving the profile we require for the selected coatings.
Hope this helps,

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