The person who sold me my boat said it had VC-17 on its bottom. I'm looking
at the Interlux website and none of the colors look like what I have, which
is kind of a muddy greenish color.

"Ernest Scribbler" skrev i en meddelelse
et...
The person who sold me my boat said it had VC-17 on its bottom. I'm
looking at the Interlux website and none of the colors look like what
I have, which is kind of a muddy greenish color.
When the boat is on land, the newly painted bottom looks very much like
it has been painted with copper paint - nice and shining - and as soon
the boat is back in the water it turns dark "coke grey" ... and this is
the color until we paint it again. There could of course be other colors
in different parts of the world, but this is what happens to our boat
....

--
Flemming Torp
Gimle/DEN-61

VC-17 (as I may or may not remember correctly) is ~90% Copper oxide.

The green color is probably coming from 'verdigris' a copper acetate
compound which forms when copper or copper oxide is in contact with
Acetic Acid. ..... which depending on the acid content (pH) of the
water will turn greenish or brown/purplish.

Try to soaking the 'green' in alcohol (ethanol - booze) and if the
green comes off easily or dissolves ... its 'verdigris'.

Ive been using VC17 on my race boat for aeons .... and every damn year
it comes out of the water a slightly different color .... a large
sewage treatment plant dumps into the lake.

In article , Ernest
Scribbler wrote:

The person who sold me my boat said it had VC-17 on its bottom. I'm looking
at the Interlux website and none of the colors look like what I have, which
is kind of a muddy greenish color.

"Flemming Torp" fletopkanelbolle2rp.danmark wrote in message
. ..

"Ernest Scribbler" skrev i en meddelelse
et...
The person who sold me my boat said it had VC-17 on its bottom. I'm
looking at the Interlux website and none of the colors look like what I
have, which is kind of a muddy greenish color.
When the boat is on land, the newly painted bottom looks very much like it
has been painted with copper paint - nice and shining - and as soon the
boat is back in the water it turns dark "coke grey" ... and this is the
color until we paint it again. There could of course be other colors in
different parts of the world, but this is what happens to our boat ...

--
Flemming Torp
Gimle/DEN-61

I get the same thing with Epoxycote (think that's it) here in Lake Michigan.
Almost black newly-painted, greenish grey upon drying after hauling-out at
season's end. Relaunch returns it to "dark coke grey." But then, I hardly
need bottom paint at all here, it seems. I'll put another coat on before
launch this spring, just fer the fun of it all, and because I'm moving to
"stiller waters" after launch so I don't have to spend the season fighting
cross-currents while docking...

Seems I've gotten a bit off topic. What were we discussing?

"Rich Hampel" wrote
The green color is probably coming from 'verdigris' a copper acetate
compound which forms when copper or copper oxide is in contact with
Acetic Acid. ..... which depending on the acid content (pH) of the
water will turn greenish or brown/purplish.

Interesting. I suspected it might be sort of a patina or something. Main
reason I asked is I want to touch up some thin spots and, having no
experience with this stuff, was concerned I might be putting VC-17 over
something that might not be VC-17.

VC-17 easily dissolves in acetone.
Take a rag soaked in acetone and 'wipe' the paint. If it 'smears'
easily, possibly changing color back to brown/copper .... its probably
VC17.
You can also 'burnish' VC17 by taking 'stiff' newspaper .... (Sunday
magazine paper is usually stiff and is 'clay filled'), wad it into a
ball, then vigorously rub the surface of the paint .... this is how
one 'burnishes' VC17 to an ultra-smooth racing surface. When you do
this you sometimes convert whatever color the VC17 has become ... and
with the burnishing 'begins' to turn 'coppery' again.


In article , Ernest
Scribbler wrote:

"Rich Hampel" wrote
The green color is probably coming from 'verdigris' a copper acetate
compound which forms when copper or copper oxide is in contact with
Acetic Acid. ..... which depending on the acid content (pH) of the
water will turn greenish or brown/purplish.

Interesting. I suspected it might be sort of a patina or something. Main
reason I asked is I want to touch up some thin spots and, having no
experience with this stuff, was concerned I might be putting VC-17 over
something that might not be VC-17.

"Rich Hampel" wrote
VC-17 easily dissolves in acetone.

You can also 'burnish' VC17 by taking 'stiff' newspaper ....

Thanks, I'll try those next time it stops raining.