I am curious what your winterizing method is?
I used the kit once with bad luck - I opened my block drains a week later because I was paranoid, and all water came out!!
So now I drain everything and flush anti-freeze through until it comes out all of the orifices. Then I shrinkwrap it and wait til spring.
My step by step winterization:
1.) A week or two before haul out, start adding sta-bil to the gas tank. Drive boat and use generator to circulate.
2.) The day I haul out, change oil in the engines and generator. After I change the oil, I start the engines and generator to circulate the new oil and then I fog the engines.
3.) Pull block drains & manfold hoses, pull fresh & raw water hoses too. Coat hanger out the block drains
4.) Remove t-stat housing. Remove plug on intake manifold and drain water from there too.
5.) Pour anti-freeze in the t-stat housing until all residual water is pushed out and I see anti-freeze coming out of the manifolds, block drains, and intake.
6.) Pour anti-freeze into the hose that comes in from the transom, until anti-freeze comes out of the outdrives.
The generator is MUCH easier to winterize!
1.) Like I said, I change the oil and restart it to circulate the fresh oil.
2.) Then, I disconnect the sea cock intake. Pull the spark plug wires. Turn generator engine over a few times to purge all water out of the system.
3) Reconnect spark plug wires, put raw water intake hose into a gallon of anti-freeze. Start generator.
4.) When anti-freeze starts blowing out the side of the boat at the exhaust thru-hull, kill engine. Its usually pretty quick
** The generator has a closed cooling system, and raw water is used to cool the exhaust only. The engine requires no "winterization" in the sense of draining water.
Thats really about it for the engine and generator. I always check the outdrive lube for water intrusion out of the bottom plug. If its clean, I top off and leave it for spring.
I am the self-proclaimed king of boat damage paranoia and OCD/overkill. Ive been known, in the past, to add a bilge heater even after the engine is drained and backflushed with anti-freeze. Fortunately, Ive made great strides in the past few years and I realize that Im worrying over nothing. 