If I am correct, it is OK to laminate epoxy over ester resin but not
resin over epoxy.
Can anybody confirm if I am correct?

Jean Pierre Dufour
mailto:jpjdufour@yahoo.comjpjdufour@yahoo.com
http://www.dominocat.orgwww.dominocat.org

Dear Jean-Pierre,

Epoxy will generally adhere to a polyester laminate. Indeed it is often used
as a barrier coat over polyester laminates to prevent osmosis. it is not
recommended that polyester should be applied over an epoxy laminate.
polyester generally will not adhere to anything except its [uncured] self
and, given sods law, anything you particularly dont want it to stick to!
There is also vinylester resin and a large number of other resins used in
the marine industry. If in doubt consult your supplier a polymer chemist or
manufacturer.

regards,

Malcolm Tennant.

Malcolm Tennant Multihull Design Ltd
PO Box 60513 Titirangi,
Waitakere 0642
NEW ZEALAND

ph +64 9 817 1988
fax +64 9 817 6080

e-mail malcolm@tennantdesign.co.nz
www.tennantdesign.co.nz
www.catdesigners.com

Jean-pierre

Composite stern tubes are generally fabricated using phenolic resins.
Polyesters, vinylesters and epoxies are all suitable for installing these.

regards,

Malcolm tennant.

Malcolm Tennant Multihull Design Ltd
PO Box 60513 Titirangi,
Waitakere 0642
NEW ZEALAND

ph +64 9 817 1988
fax +64 9 817 6080

e-mail malcolm@tennantdesign.co.nz
www.tennantdesign.co.nz
www.catdesigners.com

thank-you Norman for your response.
Our supplier for the entire drive train is doing the stern tube out of SS. I hope that will be OK with you. We asked the outer face to be as rough as possible for better bounding.

Malcolm Tennant malcolm@tennantdesign.co.nz wrote:
Jean-pierre

Composite stern tubes are generally fabricated using phenolic resins.
Polyesters, vinylesters and epoxies are all suitable for installing these.

regards,

Malcolm tennant.

Malcolm Tennant Multihull Design Ltd
PO Box 60513 Titirangi,
Waitakere 0642
NEW ZEALAND

ph +64 9 817 1988
fax +64 9 817 6080

e-mail malcolm@tennantdesign.co.nz
www.tennantdesign.co.nz
www.catdesigners.com

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I am in negotiation with the supplier to try to change the stern tube to composite. We'll keep you informed.
Cheers.

Jean Pierre.,

Malcolm Tennant malcolm@tennantdesign.co.nz wrote:
Jean-pierre

Composite stern tubes are generally fabricated using phenolic resins.
Polyesters, vinylesters and epoxies are all suitable for installing these.

regards,

Malcolm tennant.

Malcolm Tennant Multihull Design Ltd
PO Box 60513 Titirangi,
Waitakere 0642
NEW ZEALAND

ph +64 9 817 1988
fax +64 9 817 6080

e-mail malcolm@tennantdesign.co.nz
www.tennantdesign.co.nz
www.catdesigners.com

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