1939 john deere head gasket

I recently restored a 1939 John Deere model H. Shortly after I got it running I developed a very very very small water leak around the head gasket around the lower side. Before putting the new head gasket on sprayed it with some Permatex Copper Sealant. Not sure why this head gasket leaked so I re-checked my torque on the head nuts, they were fine. Due to fear the leak would eventually get worse, I purchased another new head gasket and pulled the head back off. What my question is: can I put some of that pasty-like gasket sealant (some is black in color, some is brown, and some is blue in color) that you can purchase in a tube, and put this on my new head gasket? I've applied this gasket sealant stuff of every gasket on this tractor but I never used this stuff on a head gasket before. Just wondering if this is a good or bad idea.
 
I recently restored a 1939 John Deere model H. Shortly after I got it running I developed a very very very small water leak around the head gasket around the lower side. Before putting the new head gasket on sprayed it with some Permatex Copper Sealant. Not sure why this head gasket leaked so I re-checked my torque on the head nuts, they were fine. Due to fear the leak would eventually get worse, I purchased another new head gasket and pulled the head back off. What my question is: can I put some of that pasty-like gasket sealant (some is black in color, some is brown, and some is blue in color) that you can purchase in a tube, and put this on my new head gasket? I've applied this gasket sealant stuff of every gasket on this tractor but I never used this stuff on a head gasket before. Just wondering if this is a good or bad idea.
When retorquing, each nut is loosened in sequence (just broken loose a smidge), then tightened to specification. usually this allows a few degrees of added torque. Do not use RTV pasty sealant on head gaskets, Permatex copper coat is just fine. Light full coverage then let dry for 10 minutes where 65 to 75 degrees F, then recoat for good coverage without runs. wait 15 min. Assemble. Jim
 
No pasty-like gasket sealant on the head gasket. Do as Diesel Tech tells you. Plus, after getting to a temp of 200 plus degrees, take apart to get to the head nuts and retorque these nuts and reset the valves. Head gasket, smooth side to the block and spray both sides of head gasket with your Permatex copper sealant.
 
I recently restored a 1939 John Deere model H. Shortly after I got it running I developed a very very very small water leak around the head gasket around the lower side. Before putting the new head gasket on sprayed it with some Permatex Copper Sealant. Not sure why this head gasket leaked so I re-checked my torque on the head nuts, they were fine. Due to fear the leak would eventually get worse, I purchased another new head gasket and pulled the head back off. What my question is: can I put some of that pasty-like gasket sealant (some is black in color, some is brown, and some is blue in color) that you can purchase in a tube, and put this on my new head gasket? I've applied this gasket sealant stuff of every gasket on this tractor but I never used this stuff on a head gasket before. Just wondering if this is a good or bad idea.
I knew an old mechanic that always sprayed the head gaskets with aluminum paint.
 
I used to have a 2 cylinder air cooled kohler in a bobcat that would lose a head gasket ever so often. I used the high temp red silicone on it & it never blew one again.
 

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