Empathy List Archives

FO

Frank on M/V Drifter

Mon, Sep 8, 2003 11:45 PM

Anyone used Cold Tar Epoxy?

Local bottom repair process is to sand blast paint, identify blister areas,
sand blast blisters, let hull dry over winter, in spring fair hull and apply
Cold Tar Epoxy. Cost of Cold Tar Epoxy is in the $40.00 per gal. range.
Claim to have good luck. Only color os black. Also useing this product on
steel bottoms.

Frank Worden
M/V Drifter 38' PT Cheer Men

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Anyone used Cold Tar Epoxy? Local bottom repair process is to sand blast paint, identify blister areas, sand blast blisters, let hull dry over winter, in spring fair hull and apply Cold Tar Epoxy. Cost of Cold Tar Epoxy is in the $40.00 per gal. range. Claim to have good luck. Only color os black. Also useing this product on steel bottoms. Frank Worden M/V Drifter 38' PT Cheer Men _________________________________________________________________ Try MSN Messenger 6.0 with integrated webcam functionality! http://www.msnmessenger-download.com/tracking/reach_webcam

S&

Steve & Lu Ann

Tue, Sep 9, 2003 12:46 PM

Used coal tar epoxy on the bottom of my old boat, a ferrocement yawl.
It was the only thing I found that would actually stay on the cement.
Held up great for at least 7 years. We sold the boat and it may still
be hanging on. As a side note, this is also the stuff we use at work
to coat steel-bodied and cast iron submersible pumps that will live
their lives out in various sewage pump stations. Now THERE is a nasty
environment: hydrogen sulfide gas (rotten egg smell) when mixed with
water creates sulfuric acid. Very corrosive environment. The coal tar
epoxy holds up great.

-Steve

On Monday, September 8, 2003, at 04:45 PM, Frank on M/V Drifter wrote:

trawler-world-list@lists.samurai.com

Used coal tar epoxy on the bottom of my old boat, a ferrocement yawl. It was the only thing I found that would actually stay on the cement. Held up great for at least 7 years. We sold the boat and it may still be hanging on. As a side note, this is also the stuff we use at work to coat steel-bodied and cast iron submersible pumps that will live their lives out in various sewage pump stations. Now THERE is a nasty environment: hydrogen sulfide gas (rotten egg smell) when mixed with water creates sulfuric acid. Very corrosive environment. The coal tar epoxy holds up great. -Steve On Monday, September 8, 2003, at 04:45 PM, Frank on M/V Drifter wrote: > trawler-world-list@lists.samurai.com

D

David

Tue, Sep 9, 2003 5:24 PM

Anyone used Cold Tar Epoxy?

Local bottom repair process is to sand blast paint, identify blister areas,
sand blast blisters, let hull dry over winter, in spring fair hull and apply
Cold Tar Epoxy. Cost of Cold Tar Epoxy is in the $40.00 per gal. range.
Claim to have good luck. Only color os black. Also useing this product on
steel bottoms.

Frank Worden
M/V Drifter 38' PT Cheer Men

Reply.
That would be Coal Tar Epoxy. It is applied over freshly blasted steel/Alum
and is hard to get to stick properly. Smelly, difficult to mix and spray. It
is very hard and brittle consequently abrasion resistant. It is generally
applied as a heavy coating 10 mils or more and protects the steel or alum
from corrosion. Ships even use copper based anti fouling paint over it.
It main draw back is that you cannot see corrosion under it and if you have
a void and water gets under the film it is difficult to detect and corrosion
can run amuck.
It is a popular industrial coating for tanks, rail cars, marine and offshore
structures. Widely avaiable.

Skooch Hatteras LRC 42
Worton Creek MD

Anyone used Cold Tar Epoxy? Local bottom repair process is to sand blast paint, identify blister areas, sand blast blisters, let hull dry over winter, in spring fair hull and apply Cold Tar Epoxy. Cost of Cold Tar Epoxy is in the $40.00 per gal. range. Claim to have good luck. Only color os black. Also useing this product on steel bottoms. Frank Worden M/V Drifter 38' PT Cheer Men Reply. That would be Coal Tar Epoxy. It is applied over freshly blasted steel/Alum and is hard to get to stick properly. Smelly, difficult to mix and spray. It is very hard and brittle consequently abrasion resistant. It is generally applied as a heavy coating 10 mils or more and protects the steel or alum from corrosion. Ships even use copper based anti fouling paint over it. It main draw back is that you cannot see corrosion under it and if you have a void and water gets under the film it is difficult to detect and corrosion can run amuck. It is a popular industrial coating for tanks, rail cars, marine and offshore structures. Widely avaiable. Skooch Hatteras LRC 42 Worton Creek MD

BH

Brent Hodges

Tue, Sep 9, 2003 10:39 PM

Local bottom repair process is to sand blast paint, identify blister

areas,

sand blast blisters, (endsnip)

I was always under the impression that sandblasting a fiberglass bottom was
a big no-no! It can damage the gelcoat & cause more harm that good? Am I
wrong about this?

Brent Hodges
43 Albin "Friendship"
Seabrook, Tx

> Local bottom repair process is to sand blast paint, identify blister areas, > sand blast blisters, (endsnip) I was always under the impression that sandblasting a fiberglass bottom was a big no-no! It can damage the gelcoat & cause more harm that good? Am I wrong about this? Brent Hodges 43 Albin "Friendship" Seabrook, Tx

RB

Robert Bryett

Tue, Sep 9, 2003 10:45 PM

Used coal tar epoxy on the bottom of my old boat, a ferrocement yawl.

It was the only thing I found that would actually stay on the cement. <<<<

Seeing this reminded me powerfully of my father, who died last year. He was
a civil engineer, and used to take me severely to task if ever I used this
terminology. As far as he was concerned, NOTHING was built with cement.

CEMENT is the grey powdery stuff you buy in bags. You MIX cement with water,
sand, lime, gravel etc. in various proportions to produce useful building
materials such as mortar, concrete etc. Boats are built from ferroCONCRETE.

Getting back on topic... If you haven't already done so, you might want to
look at this web site: http://www.epoxyproducts.com There's lots of useful
stuff about epoxy resins, paints etc. there. There's some stuff on coal tar
epoxy here: http://www.epoxyproducts.com/epoxypaint101.html

Best regards, Robert Bryett.
mailto:rbryett@mail.com

>>>> Used coal tar epoxy on the bottom of my old boat, a ferrocement yawl. It was the only thing I found that would actually stay on the cement. <<<< Seeing this reminded me powerfully of my father, who died last year. He was a civil engineer, and used to take me severely to task if ever I used this terminology. As far as he was concerned, NOTHING was built with cement. CEMENT is the grey powdery stuff you buy in bags. You MIX cement with water, sand, lime, gravel etc. in various proportions to produce useful building materials such as mortar, concrete etc. Boats are built from ferroCONCRETE. Getting back on topic... If you haven't already done so, you might want to look at this web site: http://www.epoxyproducts.com There's lots of useful stuff about epoxy resins, paints etc. there. There's some stuff on coal tar epoxy here: http://www.epoxyproducts.com/epoxypaint101.html Best regards, Robert Bryett. mailto:rbryett@mail.com

trawlers@lists.trawlering.com

TWL: Cold Tar Epoxy Bottom Barrier