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Sand Paper

Edi Silva  Member



What Sand paper or Sponge you guys are using after primer? I see that my guys are sanding too much and removing the primer on some spots, maybe sanding too much or not using the right product. We use 220 sand Paper, thanks for the help.

9/8/18       #2: Sand Paper ...
Robert Member

I liked 280 for primers/sealers.

9/8/18       #3: Sand Paper ...
Bob Niemeyer  Member


We also will use 280 or 320, depends on how much you need to cut to get it smooth.
We dont use sponges as they are not quality controlled for grit as sheet goods are.
People think anybody can sand, doesnt take to many smarts right? Well, sanding is when most of the damage is done.

9/8/18       #4: Sand Paper ...

I usually spray two coats of primer, first coat I sand heavy with 220 sheet and don't worry about burning through or showing substrate, I just try to get it flat. Second coat I sand with 400 sheet lightly to get grit out then spray my topcoats.

9/8/18       #5: Sand Paper ...

Good 240 like Klingspor, Mirka, 3m

If you are burning thru the primer enough that you are concerned, then you aren't putting on enough primer.

Depending on your product its common to do a tack coat when spraying primer. Hit it with a light coat wait a few minutes for it to flash off then hit it again with a heavy coat. The tack coats keeps the heavy coat from sagging or running.

9/9/18       #6: Sand Paper ...
rich c.

320 sandpaper or 320 SIASoft foam backed for contours.

9/9/18       #7: Sand Paper ...
Craig Caughlan Member


320. For flat surfaces, the 1/6 sheet is wrapped around a hardwood block that has one face covered in 3/16" felt. It cuts faster and more evenly. These blocks are also used before finishing; depending on variables, the hard face of the block is used, as the felt face will follow any irregularities in the surface of the wood.

9/9/18       #8: Sand Paper ...
Robert Member

Ive retired now but back in the day, I had / still have 2 Porter Cable 505's and 2 Porter Cable 380 sanders.One set for colored primers and opaque coatings and another set for clear sealers and clear coatings.

I cut a piece of 1/8" Plexiglass the same size as the felt pads are. I removed the felt pads on both sets of sanders and replaced them with the Plexiglass.

Using 280 I'm able to shear off any proud surface areas to achieve a pretty darn near dead flat surface for successive coats.

The Porter Cable 505's are workhorses and a great time saver. Keep it " Operating Room Clean " and it will last a loooooong time .

9/10/18       #9: Sand Paper ...

We do a bit of wizardry with our opaques. We use SW Kemvar primer that they reduce specifically for us for our viscosity. our process differs depending if they are flat parts or built up glued up parts.
1st coat is a light coat/tack coat to catch any defects and scuff and fix blemishes as necessary after tack coat flashes off..
2nd-4th coats.... We wet coat the parts sometimes up to four wet passes. Waay beyond specifications here... but the key is our total mills of the system.
We generally force cure in a large batch oven.. Flat goods get sent through a heesemen wide belt sander... nice beautifully flat panels... edges are hand prepped in sanding booths after this. all other odd/ glued up parts... trims.... large assembled items go through the sanding booth to get final prep for paint. I'm a firm believer of fill it up with primer and sand it back... you will fill defects and have plenty of material left on edges if you operate this way.. key is sand very well so you don't have to much film thickness at the end.... It's very rare we go through the spray booths for a second round of primer before topcoating with C.V.
Widebelt sanding is generally done with 320 grit cross belts and 400 grit widebelts. R.O sanding and air powered jitterbug sanding with 320 grit and 400 grit depending on the preppers preference. Hand sanding is done with klingspor ultraflex 220 grit sponges.. they leave a 320-400 grit scratch. I could see where your prep work is not turning out well with 220 grit sanding..and seeing burnt edges and burn throughs. that's a bit harsh for a final sand for a good paint job... 320-400 grit is plenty of a good mechanical bond for a 40 sheen paint job.... you will still see scratches anything past 50 sheen if you don't move up the grits...

9/10/18       #10: Sand Paper ...
Adam West  Member


I work for SurfPrep sanding. We use a specially designed sponge on a 3x4" sander on flat surfaces to cut primer all the time. If the primer is harder we use film or paper sheets to cut it flat.

9/13/18       #11: Sand Paper ...
mauricio poli Member

We use 280 after first coat. And 320 and 360 in the second coat.
SIA paper.

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