This project started as a just a simple pump replacement.  While looking online for the right replacement pump I found a Popular Science article about adding an external filter to the parts washer.

I’ve been wondering for a while, how abrasive the different colors of Scotch Brite really are.  I found the following chart today.

3M Scotch Brite Nylon Pads:

(The value inside the parentheses is directly from 3M.)

7445 – White pad, called Light Duty Cleansing – (1000) 1200-1500 grit
7448 – Light Grey, called Ultra Fine Hand – (600-800) 800 grit.
6448 – Green, called Light Duty Hand Pad – (600) 600 grit
7447 – Maroon pad, called General Purpose Hand – (320-400) 320 grit
6444 – Brown pad, called Extra Duty Hand – (280-320) 240 grit
7446 – Dark Grey pad, called Blending Pad (180-220) 150 grit
7440 – Tan pad, called Heavy Duty Hand Pad – (120-150) 60 grit

David and I spent a couple days grinding and scraping.  One coat of Rust-Oleum Rusty Metal Primer and two coats of Rust-Oleum Gloss Black.