What are some tips you could give me on lubricating a Dynorbital sander?

What can be done to prevent warping with belts, discs and other abrasive products? 

When sanding surfaces correctly, how many grits can I skip in a run? 

What PSI should I run my wide belts at? 

KLINGSPOR offers 6 sandpaper joint options for abrasive belts, which one should I choose?

I am building a line of Aluminium "general purpose" motor boats. What abrasives do you recommend for blending hull welds?

Is there anything that we can use on our wide belt paper to slow down the glazing when sanding resinous woods?

What product do you recommend for shaping the deep contours in wooden chair seats? 

What's the proper way to sand a concrete countertop?

What products does KLINGSPOR offer in waterproof sandpaper?