A gel coat finish on the mould is easy. Getting a mould finish for gel coat is a lot of work, sanding, coating and polishing. And any joins etc need gel coat added afterwards, which also needs to be sanded and polished. However, Ballotta apparently sprays gel coat on finished hulls and the result is excellent. See the C60 pics at http://harryproa.com/?p=488 I am not sure if it gas been polished or not.
Gel coat is heavier than paint, but a lot cheaper.
Epoxy does not stick well to gel coat. There are tie coat coatings available, but follow the instructions or it will be a stuff up. Gel coat failures are more hard work.
Vaseline is a novel approach, I would worry about it coming in contact with the resin, either pre or post cure. Having said which, I have used spray on frying pan grease in the past and it works a treat. But the plastic drop sheet we get from the local hardware is so cheap and easy that coating moulds is in the unnecessary work basket. NB, it must be used with peel ply. Not only to give a paintable surface without sanding, but to stop it getting incorporated in the laminate.
The next hull I build will not require sealing. This saves a lot of work and allows more variety with screwing spacers etc into the mould.
On Wed, Oct 24, 2018 at 7:23 AM Jeff Royster jeffroyster@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
So that rules out gelcoat in the mold for the II designs?Whats the reason for the peel ply inside the mold? Leaving a fair but rough enough surface for painting?I know nothing, but would think gel coat in the mold would offer the best finish for the buck and hour of labor. And certainly the most durable.On Mon, Oct 22, 2018, 11:00 PM '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
| Sorry, yes for the flat panel components built on a table. I was thinking of the hulls built in a mold. I had assumed in order to get a fair outer surface they were laid directly into the mold as with standard infusion, but I may be wrong.
I am often wrong, but, yep, the in mould parts have, at least, peelply between the fibers and the mold.
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Posted by: Rob Denney <harryproa@gmail.com>
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