I have recently been appointed FSA at a Lowes store in Allen Park Michigan. I was ask if i could find out why the Varathane EZV sander was ripping the sand paper.
My knowledge on the subject is minimal so was wondering if you could help.
What would cause a Varathane EZV sander to rip the sandpaper
sanding
Related Solutions
I use 220 grit. You sand polyurethane to (a) remove any dust bumps in the lower coat, and (b) cut the surface of the lower coat so that the upper coat has more surface area to bond to. You don't need the lower coat to be super-smooth because the upper coat will cover the roughness from sanding anyway.
For application, I use a china bristle brush. I've tried foam brushes, and I just think that I get a better finish with bristle. YMMV. (I do use foam brushes for applying pre-stain and stain; I think they work better -- for me, at least -- because stain is runnier than polyurethane. Also you have to wipe the surface down afterward, so brushing isn't the last step in the process.)
Release the paper-clamp latches. There will be one or two latches on both sides of the sander. For that model, they probably look like this (note the 2 red arrows, showing the release motion):
Pull the folded-over edges, of the sandpaper, out from under the clamps.
That model may use velcro paper, so expect that you might have to peel the sandpaper off of the base plate.
Replace with the same style and size (length/width) of paper. Assemble in reverse order. Pre-creasing the folded edges works best for getting the edge under the clamps.
You can find manuals at http://www.makita.com/en-us/Modules/Service/ServiceCenters.aspx.
Here is a manual for a similar palm sander (pdf) (AKA "Finishing Sander").
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Best Answer
If the ripping is always happening in one spot on the floor take a really close look for any nails, tacks or even screw heads that might still be protruding. It only takes the slightest thing like this to rip the disc given that it's spinning so fast.
Carefully go over the floor either pulling the tacks out or using a punch to drive the heads of the nails a few mm below the surface.
If the floor is screwed down anywhere it will be a good idea to remove the screw, use a countersink bit on the hole and then replace the screw. Again this should be a few mm below the surface.