This is a 30 year old property that I have recently bought. Unfortunately the prtevious owners have probably left their patio doors open to the rains and there is a post wet drying/ cracking and discoloration of around 1.5 feet/10feet area. I was hoping if someone could share their wisdom on how this could be repaired.The floor is probably 30 years old but had been carpetted over and therefore discovered recently.