If you must slowplay a hand preflop, learn how to get away from it if the hand doesn't go your way.
That is a critical sentence. In cash games it is most important to fold your big hand that you slow played and know that your opponents hit their hands later. If you don't it will kill your bankroll, and if you have had a little luck with other hands, you might just break even for the session.
It happens all the time, people continue to raise when they made trips from their high pocket pair when a flush or straight is highly possible.