Final question, how long would you estimate that 1/2 a bottle to last now that itās been open? My old beater isnāt exactly Graphene worthy, I planned on using it on my motorcycle but with the very small surface area of coat-able surfaces, I doubt Iāll use much. I plan on purchasing a new truck sometime within the next 6-12 months and didnāt know if the Graphene would last until then. If not, I may coat my fathers truck to not waste it.