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Sanding Concave Surfaces with DIY Foam Pad/Random Orbital

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How to sand concave topographical surfaces without buying a fancy foam-padded attachment for your Random Orbital Sander
 
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Step 1: Cut Polystyrene into a circle the same shape as your pad

Picture of 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

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

Step 3: Attach sanding disk to the other side

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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
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