Using the Sika Self-Leveling Pro Select Polyurethane Sealant to seal joint in masonry/concrete 

Love it, thanks!

Let's see if there are other suggestions but yes, a sharp razor would be the best way.

You can get them at hd or Lowe's, or local painter supply house

We added a foam backer rod and actually put some white sand on top of that because it was a deep joint. So the Sika is sitting on sand but is bonded to both sides.

@@lewisvanalstyne703 You should have used the correct size backer rod. Or at the very least put the sand first and the backer rod directly under the sealant. Putting the sealant on top of sand will cause it to fail prematurely. The backer rod gives the sealant the proper profile to perform correctly. This is critical to long sealant life.If it is installed correctly Sika sealant should last 20+ years.

​@@genecarden780 Sika actually says you can put it directly over sand

@@ada-yw1bb really? I have installed sealant professionally for over forty years. Sealant will fail prematurely if installed over sand. And it will void the warranty.( totally useless for the homeowner because 99 out of 100 will install it wrong voiding the warranty anyway) I have removed and reinstalled miles of sealant that failed because it was installed over sand. Here is the simple answer for consumers. Directly from Sika “ SITE PREP & PROCEDURE 1. Make sure that all surfaces are clean, structurally sound, dry and free from grease. Remove all dirt, oil, moisture,and/or 2. Widen crack using a chisel and hammer to at least 1/4” and use wire brush to clean out debris. If crack depth exceeds 1/2” use Sika Backer Rod to control depth.” This is what their technical manual says : “ Always use bond breaker tape or closed cell backer rod for support on horizontal joints” When it comes right down to it this us what yheynuse to determine if the sealant was installed correctly. No matter what Hohhot think you have found. I frequently have Sika field techs on my job site. I have also testified in court as an expert witness. The backer rod not only provides depth control but also the proper joint configuration. Using sand is a stupid idea for many reasons Just a couple are 1 it is impossible to get the correct joint profile, it will always end up thicker in the middle of the joint. The exact opposite of correct joint configuration. 2 to properly install the sealant it has to be installed under slight pressure which pushes the sand ahead of the joint compromising he the bond surface 3 the sand wicks the solvent out of the sealant compromising it’s cure 4 the sand absorbs moisture keeping the bottom of the joint wet year round. Technically creating a submerged joint which will fail prematurely.( sika can be submerged but requires primer not readily available to consumers.)

Yes, just leave enough gap per Sikas instructions.

Not really, it dries up in a few days.

@@abodebuildingcompany gracias

Yes, It could stop a small flood it's so thick.