I have a 1981 H22 that I purchased late last fall. PO didn't spend much time on maintenance. I plan on re-finishing the exterior wood this spring, if it ever gets warm here in Michigan. So I went to my local West Marine for teak oil and the sales person added a can of spar varnish and said I would need this to cover the teak oil. I'm a real novice at this so I'm wondering if I wasted my money or not. 