Don't forget that some type of blade structure must exist so that the blades have an attaching point or points.
I thought that the resin for fiberglass would eat foam so you use epoxy for binder. Makes the cheap blades much more expensive.
No one else has asked so I will, what type of vawt are you wanting to build? Type of blades drag or lift and size would help lots for making recommendations.
There are many types of foam so a little research might pay off before buying. MEPS XEPS EPS(first 3 are types of expanded polystyrene) polyurethane and polyisocyanurate all are types of foam commonly available but with differing characteristics.
Finis
Texas born and bred
