I have two estimates to refinish my pool. I've been told I have the original marcite finish over gunite. Not sure when the marcite was installed. I only know that the house was built in 1992. The two contractors disagree with regard to how the new finish of Diamond Brite will adhere to the pool walls and floor. One with about 10 years in business uses bond kote made by SGM first and then applies the Diamond Brite over it. The other with 32 years in business says that he tried Bond Kote and had trouble with it so he went back to the way he had always done pools which is to put on a first scratch coat of Diamond Brite and then another coat of Diamond Brite over it. Both guys have rave reviews. I've already signed a contract with the guy with 32 years experience who I trust but have not made a deposit yet. I'm sure theres more than one way to do this job. Please advise.