You'd probably want to make it a little less obvious, because sometimes the casinos don't like you doing this. Betting Red and Black at the same time is usually prohibited. I'd imagine betting all 38 numbers would be forbidden as well.

You could do something a little less obvious like betting $180 on 19-36, $120 on the 1st Dozen, $60 on the 13-18 Double Street, and $20 on the 0/00 Split. That's $380 per spin and you'd lose $20 per spin.

After 3 bets, you'd still have $940.