I have tried this many times with the Dow and PMs

Cardinal Sin…BAD IDEA !

Rarely works out ( especially with 3Xers…Decay kills )

You may look like a genius for a day or two..you may even catch a nice countertrend move BUt you will NOT usually sell before the trend resumes

You will likely be adding as the move goes against you right from the start…ANOTHER BAD IDEA and Cardinal Sin

If you think a “correction” is coming sell some positions…Cash is the hedge (Spock has said this all along)