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Bond Coating before a replaster

Posted by Bill Conant on August 31, 2011 at 4:28pm

Greetings all,

I have a very new man on my plaster crew but I use him everywhere. Multi-talented, he ties steel, decent plumber and does magic tricks with a Bobcat, AND legit papers.

On to the topic.

He was lead man on a plaster crew and they ALWAYS on a replaster that was not a chip-out,after acid wash and neutralizing and pressure wash, mix a batch of modified thinset to about a milkshake consistency and rolled it on with a regular 3/8 knap roller, finished their espressos and started plastering. The thinset was dry(ish) . His comment is "God would have a hard time delaminating this plaster."

Ladies and gentleman your learned comments please.

Thanks

Bill 

p.s. I have followed with great interest Kim Skinners and company blog posts

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Comments

  • Kevin Misley September 8, 2011 at 8:41am

    Bill,

    I use BondKote (SGM) brand. No measuring or calculating-just mix the 2 products and your good to go.

    Even on a complete stripping of plaster, I feel more comfortable applying a bonding material. Just added assurance/insurance of a sound job.

  • gari liacopoulos September 8, 2011 at 7:38am
    we always use bondcoat and have had no problems . we have seen a few replasters that were not bondcoated at all and had major delamation problems . i agree with using the pre mixed bondcoat i do not want the responsilibty of any problems later on with a cocktail . this would incur a major expense i dont want in case of any failures
  • Bill Conant September 7, 2011 at 1:13pm
    Thanks for all the valuable input. I may have been a little vague in my post. I absolutely bond  coat as part of the prep, but I was curious about what materials you all use? I have made my own "cocktail" solution of white (usually) portland,diluted acrylic, about 30% of the mix water replaced with acrylic, super-fine silica sand and meta-max in amount equal to 10% of the portland. A soupy gallon covers about 150 sq feet. Has worked flawlessly. Have used "bondkote" as well. Have seen portland and acrylic alone. I just really havent seen many failures. none for me and few of other builders. Have seen LOTS of rebound related failures that often get blamed on the plaster guys (unjustly) til reason prevails.  
  • Christian Donovan September 7, 2011 at 10:38am
    We bond coat all re-surface jobs that are not a "strip-to-the-gunite" prep.  However, we do allow the bond coat to set and cure for at least 48 hours...and have not had a single delmination since we started using this process, many years ago.
  • Kevin Misley September 6, 2011 at 2:52pm

    Bill sounds like you latched on to a good man on your crew.

    I will however rely on a manufacturer's proven bond coat product rather than a "cocktail" made up on the job site.

    Look at this way. The manufacturer develops their product using special additives and chemicals to provide the special bond needed on replasters.  Provided you follow their instructions explicitly, they will and should back you up in case of a failure. Can you, and are you willing to provide a guarantee to your customer with the on site mix your employee makes up? If you are OK with that, than that is fine.

    The bond coat material kits are nearly fool-proof. Mixing pre-measured ingredients is a no brainer.

    I just feel more comfortable using a developed product than an on site mix.

     

  • Bill Conant August 31, 2011 at 10:00pm

    Bruce, those were fantastic segues, not simply shameless plugs. Nice work.

    Thanks for your input. I cannot agree more on the reputation aspect of doing the best possible job that we can.

    Regarding the "God" comment, myself and our new man rely heavily (very heavily) on the notion that God has a good sense of humor.

    Bill

  • Bruce Wettstein August 31, 2011 at 8:53pm

    While I am passionate about my Reverse Osmosis (Pool Services Technologies) for swimming pool water (shameless plug!) company, I am also a plaster estimator during the day for the best plaster company in San Diego (Poolscape Unlimited; another shameless plug!).  When we do not do a full chip out, we always Bondkote the pool prior to plastering, and I would have to agree that it creates a much stronger finished product (I try to make a practice of not questioning what God can and cannot do, but that's another story!).  We like to allow for a 24 hour cure time before applying the finished product, but other than that I agree with your man's thinking!

     

    It may cost a bit more up front to do work like this, but it pays off in the end.  I value my reputation way more than I value a dollar, and doing it right the first time is always worth the little bit of extra effort or cost.  Sounds like you have a good man in your employ!

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