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Unread 04-29-2020, 06:50 AM   #226
JWOrl
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Thanks Dan. The water idea sounds good.
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Unread 04-30-2020, 09:20 AM   #227
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I called Custom Building Products to ask about what proportions to make the primer mix of Redgard + water because I wasn't sure of the proportions.

The guy told me they no longer recommend that for Hardiebacker and that I should use MBP (Multi-Surface Bonding Primer) as the primer instead.

I've never heard of this product. Are they just trying to make money by pushing a product that is unnecessary? Has anyone here used it? Any advantage over the water/Redgard mix?

https://www.homedepot.com/p/Custom-B...MBP1/205486856
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Unread 04-30-2020, 10:45 AM   #228
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John,

We always defer to the manufacturer's instructions. Yes, sometimes it can look like they are trying to sell more product, or justify the paychecks to the guys in R&D, but regardless we are bound by the manufacturer's instructions as they reign supreme in court and in our industry.

Now some folks will say "I've done that for 30 years..."
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Unread 05-13-2020, 04:08 AM   #229
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Thanks Houston. I ended up buying a countersink bit and using the screws.

I have to say I'm not thrilled with the Hardiebacker product so far, it has a lot of quirks that James Hardie doesn't bother to address in their instructions. And I've also found several boards with defects -- bowed, or big lumps on the surface.
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