Make a fiberglass fan shroud

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 I made a shell for the headliner of my '53 Chevy pickup and used only 2 layers of mat (about 3/32" thick) for light weight and flexibility.  It is more than strong enough.  See it here [http://www.hotrodders.com/forum/journal.php?action=view&journalid=2439&page=25&perpage=5&reverse=].  This is also an example of a part made from a female mold, but without the gel coat since it is coverd with upholstry and doesn't need a paitable finish.
+A comment on using polyester resin - you can adjust it's hardening time somewhat with the amount of MEKP hardener you add.  The more hardener, the faster it sets.  You can add too little haedener and it will never set.   It isn't that scary, there is a pretty wide range of hardener concentration that works fine.  If you have a piece that isn't setting due to cold weather or short hardener you can set the piece in direct sunlight.  UV radiation will set off this resin seem like no matter how much hardener is used.  Be careful with this  though, the resin setting chemistry gives off a lot of heat and too thick a part too huch hardener and/or solar acceleration can get the thing smoking and even start a fire!  Closest I came to that was mixing several batches of resin in a row in a tin can and just starting the next batch on top of a gelling existing one.  Got to about half a inch thick and it started bubbling smoking and WAY too hot to touch the can.
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Revision as of 15:28, 5 September 2009