Question for those who bought pool covers..........

Size: would 18 x 34 be correct to cover with approx 4 feet or more overlap on all 4 sides ?

My V21: I keep bimini and side curtains UP all winter under the current cover....which is heavy duty from Home Depot. Starts delaminating plastic " dust" after approx. 3-4 months leaving film on the boat to wash off.

I keep the boat covered all the time when not in use.....it's a year round " day cover " too so cover needs to be light enough to handle weekly. I connect it with bungie's.....real easy & ensures the cover's always snug, never loosens......