Radiator question - is this bad???

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Just to be THAT GUY today
On my 88
I ran all the snake oils thru it, seeping oil cooler bundle, tap water issues!
Several rounds and then drove it for several thousand miles before selling it( so I don't have long term info) it did not leak at all.

Lame legal disclaimer.Your experiance may varry!

 

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This got me thinking,( rutro) that block sealer/stop leak does like shawn mentioned.
I had some gasser work done and got to see some hottank results before and after .
The materials stripped off were definatley insulating the block.