Keys to successfully sandblasting a powder coated surface:

100 grit aluminum oxide media is a good choice for a blast media, it's more efficient than coal slag or sand at removing powder coating and does not create the dust issues that sand does.
Having the ability to maintain a minimum working air pressure of at least 15 cfm at 90 psi combined with the proper blast media, will make the job of blasting powder coating easier and more efficient.
Media selection and air pressure are key to making the process a worthwhile exercise.

Sandblasting, commonly referred to as "Media Blasting", is a method for prepping parts for powder coating, but it can also be an effective tool for removing powder coating.

Cons (when sandblasting may not always be a viable option):

Powder coating is meant to be very durable, and thus sandblasting can be an aggravating process if your equipment is not up to the task.
Delicate parts may not be able to withstand the pressure they are subjected to during the blasting process without warping or other damage occurring. In these instances other powder coating removal techniques may need to be used, such as a chemical stripping agent or the use of a burn off or hot strip oven.

On extremely difficult jobs, the combination of both a chemical stripper and sandblasting can be used. The Stripper can be used to weaken or soften the coating, making the blasting process easier.

What type of chemical should I use for the stripping process?

We have found that JemStrip 427 works very well in the stripping of powder coating. It is safe on Aluminum, Titanium, Magnesium, Stainless Steel, and High Strength Steel. See JemStrip 427 for more information on this product.