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Concrete finishing without power trewel burning

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Art

I have a customer planing on doing a white color hardener over fresh concrete, then using a power trowel to finish it, it's a pretty big floor so there are no other options.

On the tests he's done, he's tried diffeente blades on the power trowel but still burns the surface.

Does anyone know anything they can use to prevent the surrface burn?

 

Thanks,

Art