I'm just going to steal this from the other board from Todd The Cleaner because it's just brilliant:
Over the past year I have had a few people ask me about the grout sealing stick I use. I have made 2 of them that I keep on my truck, a 48 inch one I use for sealing floor grout and a 10 inch one I use for sealing countertop grout. Both are identical except for the length of the pipe.
RDClean said:
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Todd will you take a picture or link a pic of your grout sealer stick and share.
I have not started cleaning tile but have a lot of people ask me for tile cleaning and sealing. Maybe I can fab up something like what your talking about.
Here is my grout sealing stick.
I used 1/2 inch PVC pipe and put a fitting on each end of the pipe that has 1/2 inch male pipe threads on it. I made the pipe 48 inches long, depending on how tall you are you may want it to be a little shorter.
On one end of the stick you will want to put a 1/2 inch threaded cap on it. Drill a small hole in the cap to let air in while you are sealing the grout. Be sure not to cover the hole with your hand while working or it will stop the flow of the sealer.
On the other end I have a 1/2 inch ball valve with 1/2 inch female pipe threads on both sides. I made everything easy to take apart so it is easy to replace the valve or any other part if needed.
On the bottom side of the ball valve there is a brass bushing to reduce the pipe threads from 1/2 inch to 1/4 inch
and then a brass fitting with 1/4 inch male pipe threads to a 1/8 inch barb which I put the toothbrush on. Get a toothbrush made out of the soft flexible plastic, not the hard plastic that you can not bend. The hard plastic toothbrushes break too easy. Cut off the handle of the toothbrush and drill a hole in it so you can put it on the brass barb. When you drill the hole drill on an angle so the toothbrush will sit flat in the grout while you are sealing the grout. I usually hold the stick at about a 60 degree angle so I drill the hole in the toothbrush accordingly.
To use the grout stick you will fill the stick with sealer and then open the valve so that about 1 to 2 drops of sealer per second is dripping through the toothbrush. I usually carry a towel with me that I use to cover the toothbrush when I need to pick up the stick so I don't drip sealer all over. I also use the towel (I hold the stick above it) when setting the flow. The sealer is gravity fed so as the stick starts to empty you may need to adjust the flow a couple times so that you are getting enough sealer out. Once you have the sealer coming out of the stick at an appropriate flow just put the toothbrush in the grout lines and seal the grout. I find it easiest to go the entire length of the grout line from wall to wall going in one direction first (north & south or whatever) and after I have done all the lines going north & south I will turn and do all the east to west lines.