Originally Posted by glassdave

VE is superior on all levels. A good ve is closer in physicals to epoxy (which is essentially what ve is anyway) then poly. Elongation is where it gets its strength and ability to bond and carry a load. When you flex a polyester laminate and hear all that cracking that is the resin failing in elongation. PE is still fine for a lot of stuff, it works good with balsa core. It just drops off when you start demanding a higher level of performance, lacks durability.