The P.O. installed a sun roof and now I want to fill it in with some new glass, but I am unsure of what type of resin to use. Epoxy resin or Polyester? Any suggestions?
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I just did mine. I’ve worked with both, in fact I started with epoxy and ended up starting over with polyester. I’m glad I did. I ended up reglassing both sides of my roof. I was astounded in the end that I went through four gallons of resin, which up here anyway, is over fifty bucks a gallon, plus methyl ethyl ketone catalyst. West System epoxy was about $110 per gallon plus more expensive catalysts. There are also compatibility issues when it comes to finishing, gel coat,etc.View attachment 2263429
that top must weigh a ton now.
Epoxy resin has better adhesive properties, tensile strength and stiffness, resistance to micro-cracking and fatigue and more resistant to degradation from water ingress, ie. osmosis.
However, for the top of a 40, a basic polyester would be absolutely fine - structural FRP is my day job and quite frankly, very rarely do we need to go to an epoxy resin, in 90+ % of situations, a polyester or vinyl ester resin is suitable and besides, polyester resin and MEKP catalyst will be the most budget-friendly