Cadillac Repair: 98 Seville coolant replacement, thermagasket, metallic alloys

Question
Dear Sir,  ok, are we talking major repair, and no there is zero white smoke when the vehicle is started.    The follow up question is how much do you think the repair will be, are there diagnostics i can run to give me some type of indication and have you ever heard of a product called Thermagasket?    Thanks, new to all of this.  Here is what this company says about their product.  How does Thermagasket work?  Whenever there is a breach in the head gasket, a cracked head or block, a hot spot develops at the point of the breach. That hot spot can reach temperatures 3 to 4 times that of normal engine operating temperatures! When Thermagasket comes into contact with this superheated area, it instantly forms a perfect high-temperature seal!   Once the breach is sealed by Thermagasket’s metallic alloys, it deflects the heat away from the patch eliminating the hot spot and preserving the long term integrity of the repair!  Their website is RXAuto.com.  

Answer
There have been so many different products that I have seen over 30 years that claim to repair gaskets, engine cracks, and just about everything and I have yet to see one of these MECHANICS IN A TUBE make a permanent seal. They MIGHT work for a short period of time but eventually they fail.

I just read what they claim it will do and in my personal and professional opinion, You would be wasting your money on this miracle cure.

Either fix the vehicle CORRECTLY or trade it in.