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Also, I would not recommend them for any product that requires shaking, unless you place you finger over the rubber dispensing tip while doing so.
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This was my question, after reading the thread and doing a search, how the heck do you shake the product before application.
I just cut the bottle off the next size larger bottle ( the 32oz for my 16 oz bottles ), drilled a hole in a 2x4 laid flat, drill a hole for the size the neck on the 32oz bottle, and used a pane washer and screw to screw the 32oz bottle to the 2x4. When I am detailing, I place the bottle upside down in the larger bottle. Can use anything larger than the bottle you want to hold, just need a large enough base so it does not tip over ( i.e. if the bottles are 32oz, might want to go with 1/2" plywood 12"x 12" ).
I did not try to make it water tight as to use hot water in the holder. If I have something like this I just use the empty Clorox wipe can and give it the snap to get the product to the tip.