Over at Paper Traders, Cathy hosted an altered rusted tin swap inspired by her recent tutorial on various rusting techniques. I used my own variation of these to rust my tin...
First, I sanded ALL of the paint off of my Altoids tin lid, then sprayed it down with straight vinegar and let it dry in the sun (I did this about 3 times on each side)... it was already starting to rust with just the vinegar.
Then (wearing rubber gloves and a face mask, just in case), I mixed 4oz of 3% hydrogen peroxide with 2oz of the vinegar and about 1 tsp of salt, stirring carefully to dissolve completely; then I carefully poured it into my spray bottle. I sprayed the tin and left outside to dry, turning and repeating about 3 times on each side... I got lots of rust coating the entire tin. In the areas where the solution pooled because I sprayed a little too much, it took longer to dry but turned out really textured and dark in those spots.
Finally, I sprayed the whole thing with a coat of matte acrylic sealer and let it dry before creating my collage.
I have been wanting to try this for so long and am surprised at how quick and easy it was to do!