re: Question for your coastal fellas

Check the shells and see if they are hard or if they are pliable. A lot of times frozen shrimp will have a pliable peeling that wants to stick when you boil them. I buy flash frozen shrimp from my local grocery sometimes and if they are hard shelled then I boil them.
Two keys to boiling shrimp is once they come back to a boil or float kill the fire and then add your salt.