Introduction: Sanding Concave Surfaces With DIY Foam Pad/Random Orbital

By

How to sand concave topographical surfaces without buying a fancy foam-padded attachment for your Random Orbital Sander

Step 1: Cut Polystyrene Into a Circle the Same Shape As Your Pad

Cut Polystyrene into a circle the same shape as your pad

Step 2: Spray Adhere One Circular Sheet of Hook&loop to Foam

use spray adhesive to attach hook&loop paper with the fuzzy side out. 

Step 3: Attach Sanding Disk to the Other Side

attach sanding disk (sand paper out) to the other side of the foam.  

now you have a thickened piece of sand paper backed by foam that can follow concave and convex surfaces