You might. Some say it can free stuck piston rings and that would most likely bring up compression. There is only one way to find out. I prefer sprayable seafoam but I really could not tell you if it is better then the BRP stuff or not.
Warm up the motor. Bring it to a fast idle. Spray seafoam through the carb 9 or 10 times. Let it bog on it a for those times and recover and then spray it liberally until the motor stalls. Then tilt up the motor and remove both spark plugs. Spray it into the cylinders and rotate the flywheel to get the stuff into the rings etcs. Let the motor sit for at least 30 minutes. Now replace the spark plugs, lower the motor into water and start it up and bring it to a fast idle. Spray some more through the carb and you are pretty much done. If you have the motor on a boat take it out and run it hard for 5 or 10 minutes at WOT to blow out all that seafoam and carbon.