Crank not start and spark plugs all had light brown liquid on them

I just got a diagnostic on my car listed above earlier today. I was told that I my head gasket either was blown or had a crack in it. Thing is it was running perfectly fine the day before it stopped starting up. It tries to turn over but never starts, I initially thought it was the starter. Also he pointed out that the coolant is some how leaking into the gasket (he showed me how the spark plugs all had light brown liquid on them from the radiator ). After doing some research I found out about something called "Rislone Head Gasket and Cooling Sealant". This product is said to prevent leaks from the coolant into the head gasket. Should I try this or just consider a new car (don't really have the funds for option b, lol) please advise! Thanks