Vinyl Ester Over Epoxy

To cover wood a laminate using epoxy resin and 10 oz cloth will yield a much better job than 10 oz.

Vinyl ester over epoxy.

Epoxy adheres to wood much better than polyester does. Cured epoxy tends to be very resistant to moisture absorption. Using epoxy you can improve the laminate properties with a post cure almost always. Specifically proper cure of vinyl ester resins and a 15 year study of the effective use of permeation barriers in marine composites to prevent corrosion and blistering.

In the case where a part originally manufactured utilizing polyester or vinylester has yielded to strain and cracked a well reinforced epoxy repair will tenaciously hold to the substrate with 2000 psi strength vinylester. For vinylester resins and even less for polyesters. Many high strain repair areas and lightweight parts must flex and strain without micro fracturing. In areas that must be able to flex and strain with the fibers without micro fracturing epoxy resins offer much greater capability.

Regarding costs vinyl ester resin is more expensive than polyester resin but cheaper than epoxy resin. Epoxy resin is an ideal resin for high performance and light weight parts. Vinyl ester resins are produced by the reaction esterification between an epoxy resin and an unsaturated monocarboxylic acid. Allow the epoxy to cure to the point where sanding produces a fine powder.

The two main types of epoxy resins are bisphenol a diglycidyl ether dgeba and epoxy phenol novolac epn. Vinyl esters also use peroxides e g. It adds excellent strength rigidity adhesion water and chemical resistance. Before applying gelcoat over epoxy.

Cloth and polyester resin. Has some great papers on this which i am quoting from. Quality epoxy resins stick to other materials with 2 000 p s i. Essentially they comprise a base of polyester resin strengthened with epoxy molecules in the backbone of the molecular chain.

Epoxy vinyl ester resins ver are an important class of high performance thermoset molding resins. Wash away amine blush with water and an abrasive pad such as a 3m 7447 hand pad. Before coating a fully cured layer of epoxy with polyester gelcoat prepare the surface properly to remove any amine blush. Vinylester is essentially a styrene modified epoxy resin.