Question about Dewalt DW421 5'' orbital sander

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I have a Dewalt sander I am using for wet sanding on a boat hull. I have already burned one sander out do to moisture I figure is there a way to protect the new sander from this happening again I am sanding surfaces above my head so the sander is upside down 90percent of the time

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Impossible not to get water in the bearings and motor. It is vibrating too fast. You need air sander. Or sand dry, then wet sand the primer by hand.

Posted on Dec 17, 2010

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Posted on Jan 02, 2017

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What type of sandpaper do I use on a dewalt dw421?


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Hi can I use my Dewalt polisher and change to sandpapper if so what parts will i need for instance glue new flexable pad sticky 220 papper can you please elaberate a little what in going to need thanx ...


I'm not sure I understand your question, but I'll give it a go.

The DW421 is a sander already. If you want to change it to a polisher, you can buy polishing pads to go on it.
If you have a Dewalt polisher and want to convert to a sander, you can buy sanding disks to fit your polisher. They are installed on the spindle and I believe you can get a backing pad for it also.

Hope that helps

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1 Answer

How do I secure a piece of sandpaper on the dewalt orbit palm sander?


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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

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Cant figure out how to install the sanding disc's


This info may help;

Features: DeWalt D26451K 5" Random Orbit Sander Kit
  • 3.0 Amp motor operates at 12,000 opm providing ideal sanding speed for smooth finish
  • Textured anti-slip top & body grip provides ultimate comfort and control during prolonged use
  • Controlled Finishing System maintains pad speed and minimizes gouging during start up
  • Dust-sealed switch prevents contamination
  • Sealed 100 percent ball-bearing construction provides longer life
  • High capacity dust bag with built in vacuum adapter provides maximum dust collection with or without vacuum
  • Dual-plane counter-balanced fan reduces user fatigue
  • Accepts 5", 8-hole hook & loop paper allows sanding discs to be switched back and forth quickly and easily
  • The sanding discs mate to the sander plate similar to Velcro, and this particular sander uses a 5" disc with 8 holes in it. Can be purchased in Home Depot, Lowes, etc....
Hope this helps!

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