Q. Do I need to cut out or gouge out the cracks for this kit?
A. No, the only requirement is to drill a ½ hole at a 45deg angle every 6 inches along the crack's alternating sides.
Q. Not much polyurethane comes out from each stroke of the handle. Is this normal?
A. Yes, since the modified applicator needs to achieve pressures above 2500psi manually, many strokes of the handle are required to get the necessary volume of poly into the crack. Possibly 30 pumps per injection packer. It is a good workout.
Q. How do I know if I injected enough polyurethane?
A. As you inject the product, you will start to see leaking poly exit the cracks. Once you see the chemical seep out ¾ the way to the next packer, you can move up to the next injection packer.
Q After injecting foam is coming out of the wall and looks very messy, what do I do?
A. Let the Polyurethane sit for a day, and you can easily scrape the excess off the wall and floor.
Q. Can I seal up between the packers to keep more product in the wall?
A. Yes, you can seal up with some epoxy sealant or hydraulic cement, but you must be conscious of how much product you are injecting, so you do not under inject. One way is to install the packers in your drilled holes as you go up the wall. As foam enters the next packer hole, install that packer.
Q. Can I reinject into previous packers once I get to the end?
A. Yes, you can go back and forth as many times as you need to ensure all the crack has been thoroughly injected.
Q. Can I use the injection tool again later after I have used it?
A. Yes, but you will need to flush out the piston/hose and tip with some solvent like Xylene or M.E.K .Then pump a little engine oil through to lubricate for storage. Flush with solvent before the next use.
Q. How long should I leave the packers before I can remove them?
A. They can be left in the wall, but if they are in the way. Leave in place for seven days approximately.
Q. After a week, I knocked off the packers, and liquid leaked out. Is this a problem?
A. No it is not a problem. The polyurethane stays active for about a week and will react with any moisture it encounters in the wall, any cracks will be sealed against moisture at that point.
Can I inject while the crack is actively leaking?
Yes, this is probably the best time to inject the high-pressure polyurethane as there will be plenty of moisture in the wall to start the hydrophobic chemical reaction.