Hot wax and scratch 'n' sniff...

If you use Paint Shop Pro, there's a hot wax filter you can use - I'm not sure whether Photoshop has one or not. I'm facing a bad drawing and there's a candle burning. I remember a project in my art-teacher book suggesting unifying a collage with a wax coating.

Encaustic looks pretty cool, she thinks, pouring the candle all over the bad drawing. Blow dryer gets rid of some of it. And now my sketchbook smells like a gift shop.

Not that Eau du Smelter is a big seller....and proof positive that sometimes a bad drawing just can't be rescued.