New Deck Question ?

[pcfishslayer]

I bought a 20' CC from fellow CSC member Luis. I am in the process of replaceing the deck. I have the deck cut out. I was hoping to find out if it is best to sand the gel coat down to the glass on were the old meets the new. I was told that would provide a better bond. Could some one tell me if that is true. Any other words of advice would from others that have already done this would be appreciated.