That would be PVA (Poly Vinyl Alcohol or the brand name "Part All #10",
green liquid)
It washes off with water. (not MEK)
Bob
jerry wrote:
MEK Peroxide (methyl ethel keytone) is the water-soluble plastic film that
you spray over a gel-coat repair, to keep off the oxygen, which retards the
curing process.
I better way on an older boat is to use a two-part polyurethane. Rather
than LP (linear polyurethane), an automotive type is better because you can
sand out any runs, and it stands up to UV better. You can spray it over
gel-coat (prep just like you would when using gel-coat, then wetsand out the
edges and buff. It'll be the shiniest spot on the boat, esp[ecially ten
years later. The best auto-type polyurethane is Deltron, made by PPG. You
can't get it many places now in CA because of harrassment from the air
quality people, but it IS still legal for boats and airplanes.
Jerry
jerrymontgomery.org
----- Original Message -----
From: "Bob Olson" <[EMAIL PROTECTED]>
To: "For and about Montgomery Sailboats"
<[email protected]>
Sent: Sunday, April 17, 2005 10:01 AM
Subject: Re: M_Boats: Gel Coat Matching
Bill, From what I've been able to glean from various websites regarding
gelcoat, is that its primarily a production process material. In other
words, it works best when sprayed into a mold as the first layer in the
production process before the layers of fiberglass. I have a feeling
that it would be difficult to replicate the original gelcoat look by
applying it over a hull repair. And, I'm guessing that it would need to
be covered in order to cure properly. Typically, a boat shop would spray
a water soluable material over the gelcoat as a final step. After the
gelcoat had cured, then the top layer would be washed off.
That's why I'm leaning toward a linear polyurathane (sp?) product. More
expensive than cocaine, but it sounds as though it's the right product
for post production repairs.
How the hell do you de-core part of a rope for a centerboard pendant?
That's the thing that got me boggled right now.
--Bob
[EMAIL PROTECTED] wrote:
In a message dated 4/17/2005 12:08:11 AM Pacific Standard Time,
[EMAIL PROTECTED] writes:
West System believes that you can put gelcoat over their epoxy.
Bob,
I was about to go buy another book when I had the right one all along
(West
System Boat Repair & Maintenance). The book is inexpensive, around $3.00.
On
page 8 it refers to the steps needed to use gelcoat over epoxy. Looks
like my
little projects will be fine with the use of epoxy only. No need to use
polyester resin for the small hole repairs I've got in mind. However,
they do
recommend a long epoxy cure time of two weeks prior to putting on the
gelcoat finish.
Bill
"Tipperary"
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