Here the one I made tonight:
Here's the notch:
Here's the result of an entire 20 oz bottle of Fine (24 grit) grade walnut shell media from Harbor Freight. You see the bottom left corner? That's all I got done. I was able to remove 2 layers of the paint but the bottom layer doesn't show any sign of coming off. As I said, I emptied an entire 20 oz bottle of blasting media on that small section.
Stripping the flat surfaces with stripper is easy enough, but I was hoping to use the blaster to strip in between the fins. My attempts at that on another vent failed just as miserably.
One video I saw said 50 PSI was sufficient. I had to set mine at 80 PSI to get the blaster to do anything. The paint just laughed at 50 PSI.
Am I expecting too much from this rig?