I used the Permatex substitute for hylomar on my last 4.0 build and 2000 miles in all good.
i recently replaced the water pump on my 300tdi. Most said to not use any sealer, just a little grease. Well, I guess there were some very tiny scratches in the gasket mating surface. It now very lightly weeps coolant. It doesn’t even stay wet long enough for me to see it. There is just a bit of residue. I can smell it occasionally but unless it gets worse I’m leaving it alone. This is the first and last time I will use no sealer. Who knows how many times the water pump was replaced and the mating surfaced has been scraped and lightly damaged. it’s a 30 year old engine. A little light application of sealer, I can’t see any drawbacks.
i recently replaced the water pump on my 300tdi. Most said to not use any sealer, just a little grease. Well, I guess there were some very tiny scratches in the gasket mating surface. It now very lightly weeps coolant. It doesn’t even stay wet long enough for me to see it. There is just a bit of residue. I can smell it occasionally but unless it gets worse I’m leaving it alone. This is the first and last time I will use no sealer. Who knows how many times the water pump was replaced and the mating surfaced has been scraped and lightly damaged. it’s a 30 year old engine. A little light application of sealer, I can’t see any drawbacks.