Jeanie.....You can do either technique over imperfect walls. Neither will hide the imperfections - and may even make them more visible.
As far as how to do them - please go to RLHOME.POLO.COM - watch the videos and read the directions there before you purchase the product.
Suede can be done alone - leather cannot.
My last word of advice is read the can and practice your technique somewhere that doesn't matter - BEFORE you start on your powder room.
If you follow the directions - the products work very well!
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