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decodeddiesel · 01-07-2002, 01:41 PM

I can tell you that JB Weld and Epoxy will NOT work in cases where there is a temp swing. I know this as I originally used JB Weld to afix 1/2" barbs to my 3/4" IN-OUT on my heatercore. I let the JB Weld set for 48 hours before I began leak testing. I leak tested with a Danner 5 in a loop with the heatercore for 24 hours with no leaks whats so ever. I then installed the system where it was running for 2 weeks with no problems. Then one day I found a drop...the drop increased in size....I took the system down and used some g00p on the fitting, problem solved. Next thing I know, about a week later the other fitting began to leak....simple g00p job later and everything was right again in my world. This was 6 weeks ago and no leaks whats so ever detected. g00p is designed to withstand expanding and contracting with varrying heat loads, where JB Weld clearly was not. A waterblock has even greater temp swings, therefor I would hafta say the only proper way to seal a WB is either with solder, or with a silicone O-ring that can withstand high heat.

01-07-2002, 01:41 PM	#42
decodeddiesel Cooling Savant Join Date: Oct 2001 Location: classified Posts: 534	I can tell you that JB Weld and Epoxy will NOT work in cases where there is a temp swing. I know this as I originally used JB Weld to afix 1/2" barbs to my 3/4" IN-OUT on my heatercore. I let the JB Weld set for 48 hours before I began leak testing. I leak tested with a Danner 5 in a loop with the heatercore for 24 hours with no leaks whats so ever. I then installed the system where it was running for 2 weeks with no problems. Then one day I found a drop...the drop increased in size....I took the system down and used some g00p on the fitting, problem solved. Next thing I know, about a week later the other fitting began to leak....simple g00p job later and everything was right again in my world. This was 6 weeks ago and no leaks whats so ever detected. g00p is designed to withstand expanding and contracting with varrying heat loads, where JB Weld clearly was not. A waterblock has even greater temp swings, therefor I would hafta say the only proper way to seal a WB is either with solder, or with a silicone O-ring that can withstand high heat.