DO NOT use loc tite. Find a box end wrench about 8 inches long of the correct size (metric for OS engines) and a glove like Ken said. Tighten it down VERY firmly. You are NOT going to damage the nut or crankshaft, they are of very hard steel. You'll crush the prop first, especially if it is wood. The 4-way wrench is good for the plug and initial prop alignment only, just not enough leverage.

For the hydraulic lock - put a rag over the open plug hole while spinning the motor with your starter and it will catch the fuel spray from the motor. Then replace plug and start.