Well started reading
He says as long as surface is clean it should not matter as long as its not abrasive to go in cirucular or up and down motions...
"If you’re applying non-abrasive products, i.e. products that do not scratch or scour the finish, and your applying them with a soft, clean applicator and using good technique, then you should not be instilling any scratches or swirls no matter what direction you’re moving your hand.
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