Using polyester and vinylester resins both

Since the main advantage of vinylester resin is its resistance to moisture (avoiding blistering), would it be acceptable to use it below the waterline and then use polyester resins above?

Or perhaps use the vinyl for the hull construction but then use the poly for deck and deckhouse?

Is there any advantage to using the vinyl in deck/deckhouse or is it just a waste of money, especially for a large vessel where these costs add up quickly.

 

I have seen a lot builders use vinyl easter as skin coat and polyester for the rest of structure to save cost. my experience shows polyester results more shrinkage compare to vinyl easter.

 

Using VE in a boat/yacht only where needed is typical.

 

VE gelcoat with polyester laminate is a good combination too.

 

Sounds like this could result in delamination or other structural failure.

 

Please explain why?

 

Using polyester behind vinyl ester is standard practice with fibreglass products in wet environments like boats, baths and showers and swimming pools, has been for decades.

One advantage of vinyl ester is it's better physical properties as well, this could mean a lighter layup or enhancing the properties of materials like kevlar and carbon, polyester will fracture before many of these materials get even close to their capabilities.

 

Great to know. Thanks.

 

I build the inside with cheap stuff, the middle (structure) with more expensive stuff and the outside with the really expensive stuff. More important is your fiberglass layup. It is not about adding more, but doing it in the right places.