To make matters worse we have had a unseasonably warm week and I half with temperatures in the upper 60's (not normal February temps in Illinois). I decided I HAD to figure out a solution to the problem of fumes collecting in the building where I am building the CS AND work 9 hours a day during the week so I could get back at it. 

After a little head scratching I had an idea. I decided to build a removable tent over the hull.  I used ½" metal electrical conduit and bent it to form six supports. The center one is setting on 2x4 and I used two diagonal supports to make it free standing. I then connected the other conduit supports using strips of scrap ¼" OSB.  The one end has a hole drilled and the conduit is run through it..  The other end has a crude locking slot that just slips over the conduit.  This allows me to to quickly set it up or tear it down.  The only fasteners are two wing nuts used to hold the diagonal braces in place on the side of the conduit. With two people it sets up in about 3 minutes.

I then covered it with a large sheet of fairly heavy plastic.  This should help contain the fumes but still I need to get rid of them - some type of exhaust system.  As you can see from photos of my shop I am some what of a "junk" collector.  In fact under the shop is a full basement and I have even more "serviceable used items" stored down there!  I went down and scrounged around and found an old fan that I had salvaged of a dead refrigerator.  It had a 7" blade,  ran at a fairly slow RPM  and was very quiet. I really wasn't looking for high volume just a low constant flow that would cause negative air pressure under the plastic and hopefully expel the gas that is causing me problems.

The shop is an old brick building and there is only one window located near the ceiling at the back  which is about 50' away. I used 4" DWV plastic pipe (I use the same stuff for my dust collection system in the shop) as my duct which I hung from the ceiling with wire. On the boat end I dropped down with 4" flexible dryer vent.  On the other end I mounted the fan on a piece of plywood cut to fit the window.  To it I bolted a small plastic bucket to serve as a reducer from the 7" fan to the 4" pipe.  Crude, yes, but I think it will work and it was cheap.  It doesn't move a lot of air but I don't need it to.  I plan to let it run 24 hours a day - time will tell.

With this done it is time to put it to the test. The bottom of the hull is ready to have the fiberglass added so I will do the first half this weekend and then the other side next weekend.  It will then need to set for about 3 weeks for it to totally cure before I can paint.