PVA

[Garland Gray II]

I would like to find some PVA, quick.

I need to make some gelcoat repairs today, and I understand that spraying
PVA on top keeps the gelcoat (white) from discoloring. I'm not sure where
you find PVA, but I think I've heard that hairspray works.

Is this true, or where might I find the real stuff ?

[Brian Nystrom]

Garland Gray II wrote:
> I would like to find some PVA, quick.
>
> I need to make some gelcoat repairs today, and I understand that spraying
> PVA on top keeps the gelcoat (white) from discoloring.

PVA is used on top of gelcoat to promote curing, as it seals off the
surface from the air. You can accomplish the same thing by purchasing
"finish gelcoat" instead of the typical "laminating gelcoat". Finish
gelcoat contains a wax that migrates to the surface and seals it so it
will cure properly.

I've never heard of PVA having any effect on gelcoat color.

> I'm not sure where
> you find PVA, but I think I've heard that hairspray works.

I find that very doubtful.

> Is this true, or where might I find the real stuff ?

Any decent marine supplier will have it.

[cavelamb himself]

I've sprayed PVA over polyester laminating resin to make it non-gummy
when cured.

Never heard anything about gellcoat though.

Richard
--
(remove the X to email)

Now just why the HELL do I have to press 1 for English?
John Wayne

[Brian Nystrom]

It's the same principle, as both are polyester resin products.

[cavelamb himself]

Yes, but gell coat has wax mixed in - same as finishing resin.
The Wax floats to the surface during cure and blocks off contact
with air.

PVA (or anything else) is not required.

[Jerry]

cavelamb himself <cave...@Xearthlink.net> wrote in
news:lPOdncck7rNJHazV...@earthlink.com:

>>
>> It's the same principle, as both are polyester resin products.
>
> Yes, but gell coat has wax mixed in - same as finishing resin.
> The Wax floats to the surface during cure and blocks off contact
> with air.
>
> PVA (or anything else) is not required.
>
>
> Richard

Polyester Gel coat comes in waxed and non waxed, non waxed is usually
used for in in-mold layup where the gel coat can cure hard without the
presence of air. You can add wax to non waxed for non mold or in air
curing or use non waxed and seal from air to give a hard cure by
covering with something like PVA. PVA works, as would almost any other
air barrier..

[cavelamb himself]

Ya got me there, Jerry.
In that case PVA should work fine...

[Dan]

On Sun, 18 May 2008 08:24:33 -0400, "Garland Gray II"
<g.g...@nospam.com> wrote:

>I would like to find some PVA, quick.
>
>I need to make some gelcoat repairs today, and I understand that spraying
>PVA on top keeps the gelcoat (white) from discoloring. I'm not sure where
>you find PVA, but I think I've heard that hairspray works.
>

Yes, Aquanet works.

[Daniele Fua]

Garland Gray II ha scritto:

Isn't PVA just the common and cheap white wood glue you may find in
plastic cans at every hardware store?
Here we call it Vinavil but it is a brand name (like we use Biro for
ballpoint pens...).

Daniel

[RW Salnick]

Daniele Fua brought forth on stone tablets:

Close, but not quite (although it might work jsut fine for sealing out
air). The PVA in white glue is polyvinyl acetate. The PVA being
discussed in this thread is polyvinyl alcohol.

bob

[Garland Gray II]

Thanks all. I'll try to find the real stuff. The urgency has passed.

"Garland Gray II" <g.g...@nospam.com> wrote in message
news:0eVXj.87052$y05....@newsfe22.lga...

[Garland Gray II]

Thanks Dan; but are you saying that hairspray works for sealing the gelcoat,
or that it works as hairspray ?
Just checking to be sure.
"Dan " <Dan@> wrote in message news:4831ff00...@news.gotsky.com...