blue devil products - anyone use them? need temp head gasket fix

so like the title says, my head gasket on my 91 TT is just starting to go. its not mixing with other fluids but it is leaking to the outside with no overheating or anything crazy. just requires me to refill the reservoir tank every couple months.

a friend recommended i try blue devil coolant leak fix since its not like other stop leak products full of gunk that can mess up the engines.

has anyone ever tried it or heard of it with any positive results? i want to use it to just stop/slow the leak for now until i get all the parts i need to replace while doing the head gasket. thanks

My cousin tried it. It gunked his entire coolant system so bad that he had to replace his radiator.

No its not like other stop leak with pellets or whatever, but it still can plug shit up.