In the processs of final sanding, and researching varnishes. It seems that McCloskey Spar Varnish is by far the cheapest solution. I can get it at home depot for less than $10.00 a quart. This is at least half the price of other varnishes I see in the local stores and on the web.

What are the drawbacks of using this less expensive varnish. I am trying to keep costs down, but don't want to risk the hundreds of hours I've put into this project.

Thanks in advance. Any comments from experience would be appreciated.