Any suggestions?

Joined
Oct 25, 2016
Messages
2,804
Location
Montana
Name
Swani
Slate is around 10 years old and the old brick pavers are from an old street in Helena MT. I believe the brick is clear coated with poly. Not sure about the finish on the slate. Owners said only Bona's been used. What are your thoughts on prespray and PSI? I only have a spinner and I'll be using my TM.
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Mikey P

Administrator
Joined
Oct 6, 2006
Messages
112,308
Location
The High Chapperal
Slate is just about the best stone to use a CRB on, if you dont have one, use a push broom to scrub in an alkaline carpet pre spray. Get giggy and go to town in a few directions.

Same with the brick.

700 psi and dont let the spinner sit in one spot or you'll power etch a ring into the surface.

You can raise the pressure 1 or 2 hundred on the brick but lower the heat to well under 200°

Seal the slate with a solvent impregnator after its dry.

Even Marty could do this.
 

Nomad74

Boy Sprout
Joined
Feb 4, 2016
Messages
23,464
Location
Redding
I have something similar I'm bidding for the US Foretery Admin building. But it isn't slate. It's stamped concrete with a heavy layer of sealer on it. Parts are so thick with sealer there are tiny little bubbles or salts coming up within it making a haze. I told them I could clean it but to get the haze out it would need to be stripped. Had to walk because I could see I could not clean it to their expectations.
 

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