Use whatever method others suggested on the seasonings. But it you want them gushing with juice when you peel them then do this....After water is boiling, drop in your basket of crawfish. The water will stop boiling, once its is rolling again I only let it roll for 2 minutes and shut down the fire. Let them soak 15-20 min, but the way to get them full of juice is to cool down the water quickly. Dump a bag of ice in it while soaking and I also hose down the outside of the pot to cool it quicker. My take on this is that there is steam inside the crawfish body keeping the water out but if you cool them down slightly it draws in the liquid. That's my story and I'm stickin to it.
But the juice pours out of them everytime!