Needing to change a still gritty sanding belt because it is clogged and gunked up with sawdust is a different matter.
Why does it always happen when you’ve got just a little bit left to sand and you’re out of new sanding belts? Is it some DIY conspiracy I don’t know about? Possibly.

Did you know you can clean sandpaper and prolong its life? Yep, you can! Cleaning a sanding belt is a cheap and easy thing to do. You might already have just what you need to do it too.