Re: [bolger] Re: epoxy and finishing......i.e.how long till i can paint?
Bob--Others have written about how long to let epoxy cure before painting. I've had good luck with West System letting it cure over night, washing with a diluted soapy water (a squirt of dishwashing detergent in a bucket of water--don't think precise ratio is critical), rinsing the surface with lots of water (hose it down), dry it thoroughly, sand lightly, and apply primer. This boils down to paint it within a day after the epoxy gets hard.
I agree that all finishing is best done inside, but that is not always possible. If there will be more than a few days between the time you move it out and the time you paint, suggest you cover it with a tarp. I've built a couple of boats out in the yard, covering up with the tarp at night, and was happy with the results.
John T
I agree that all finishing is best done inside, but that is not always possible. If there will be more than a few days between the time you move it out and the time you paint, suggest you cover it with a tarp. I've built a couple of boats out in the yard, covering up with the tarp at night, and was happy with the results.
John T
----- Original Message -----
From:cha62759@...
To:bolger@yahoogroups.com
Sent: Monday, July 12, 2004 10:48 AM
Subject: [bolger] Re: epoxy and finishing......i.e.how long till i can paint?
West epoxy can take up to a week to cure. I would assume that other
epoxies have a similar cure time. Wash thoroughly before sanding to
get any hint of amine blush off the epoxy.
Coat AND SAND before assembling. If you are using Brightside primer
read the directions on the can. When the can says sand to
"translucency" it means to sand almost all of the primer off. This is
especially important for paint exposed to the weather. This is the
voice of experience. The microspheres in the primer attract water and
you may get bubbles in your finish coat. The primer and paint can take
a week or more for a full cure. Be careful about exposing it to the
weather prematurely. Try to get any finishing done under cover and
long enough for a full cure. Painting in full sun is a no no. READ THE
DIRECTIONS ON THE CAN, NO SHORTCUTS.
Bob Chamberland
--- Inbolger@yahoogroups.com, "Jason Stancil" <jasonstancil@h...> wrote:
> So i'm slathering, slinging and spreading epoxy in all the micro's
> nooks and crannies.(note to anyone on the verge of starting to
> build: coat your panels FIRST) I'll give it some sanding and then i
> wait.....? How long? Is a 3 week wait overkill to let the epoxy cure
> before priming the interior. I'd rather be safe than sorry as i'd
> like to get a good bond (interlux brightside primer).
>
> Also the boat is too big now, so i've got to get it out in the yard.
> Do i need to be concerned about the epoxy being exposed to the uv
> for a month.....or is that not enough time to do any significant
> damage.
>
> Thanks,
> Jason
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[Non-text portions of this message have been removed]
> So i'm slathering, slinging and spreading epoxy in all the micro'si
> nooks and crannies.(note to anyone on the verge of starting to
> build: coat your panels FIRST) I'll give it some sanding and then
> wait.....? How long?West Systems primer test page says -
No adhesion problems were found when paint was applied to cured
epoxy. When the paint was applied over partially cured epoxy, two of
the paints, Bulls Eye 1-2-3 and MOORWHITE oil-base primer, were a
bit soft after 24 hours and could be scraped off. However, this was
a short-term adhesion problem. After a few days of additional
drying, adhesion improved to acceptable levels. To put this in
perspective, I can say that in the past few years I have personally
used Bulls Eye 1-2-3 primer successfully on home projects over
partially cured epoxy without any adhesion problems.
West epoxy can take up to a week to cure. I would assume that other
epoxies have a similar cure time. Wash thoroughly before sanding to
get any hint of amine blush off the epoxy.
Coat AND SAND before assembling. If you are using Brightside primer
read the directions on the can. When the can says sand to
"translucency" it means to sand almost all of the primer off. This is
especially important for paint exposed to the weather. This is the
voice of experience. The microspheres in the primer attract water and
you may get bubbles in your finish coat. The primer and paint can take
a week or more for a full cure. Be careful about exposing it to the
weather prematurely. Try to get any finishing done under cover and
long enough for a full cure. Painting in full sun is a no no. READ THE
DIRECTIONS ON THE CAN, NO SHORTCUTS.
Bob Chamberland
epoxies have a similar cure time. Wash thoroughly before sanding to
get any hint of amine blush off the epoxy.
Coat AND SAND before assembling. If you are using Brightside primer
read the directions on the can. When the can says sand to
"translucency" it means to sand almost all of the primer off. This is
especially important for paint exposed to the weather. This is the
voice of experience. The microspheres in the primer attract water and
you may get bubbles in your finish coat. The primer and paint can take
a week or more for a full cure. Be careful about exposing it to the
weather prematurely. Try to get any finishing done under cover and
long enough for a full cure. Painting in full sun is a no no. READ THE
DIRECTIONS ON THE CAN, NO SHORTCUTS.
Bob Chamberland
--- Inbolger@yahoogroups.com, "Jason Stancil" <jasonstancil@h...> wrote:
> So i'm slathering, slinging and spreading epoxy in all the micro's
> nooks and crannies.(note to anyone on the verge of starting to
> build: coat your panels FIRST) I'll give it some sanding and then i
> wait.....? How long? Is a 3 week wait overkill to let the epoxy cure
> before priming the interior. I'd rather be safe than sorry as i'd
> like to get a good bond (interlux brightside primer).
>
> Also the boat is too big now, so i've got to get it out in the yard.
> Do i need to be concerned about the epoxy being exposed to the uv
> for a month.....or is that not enough time to do any significant
> damage.
>
> Thanks,
> Jason
So i'm slathering, slinging and spreading epoxy in all the micro's
nooks and crannies.(note to anyone on the verge of starting to
build: coat your panels FIRST) I'll give it some sanding and then i
wait.....? How long? Is a 3 week wait overkill to let the epoxy cure
before priming the interior. I'd rather be safe than sorry as i'd
like to get a good bond (interlux brightside primer).
Also the boat is too big now, so i've got to get it out in the yard.
Do i need to be concerned about the epoxy being exposed to the uv
for a month.....or is that not enough time to do any significant
damage.
Thanks,
Jason
nooks and crannies.(note to anyone on the verge of starting to
build: coat your panels FIRST) I'll give it some sanding and then i
wait.....? How long? Is a 3 week wait overkill to let the epoxy cure
before priming the interior. I'd rather be safe than sorry as i'd
like to get a good bond (interlux brightside primer).
Also the boat is too big now, so i've got to get it out in the yard.
Do i need to be concerned about the epoxy being exposed to the uv
for a month.....or is that not enough time to do any significant
damage.
Thanks,
Jason
Save yourself some grief and sand after it's had quite a while (say a
week) to cure. If you're going to do scraping, which is often much nicer
than sanding, do it fairly soon after the epoxy job, the sooner the
easier after some reasonable amount of cure. Don't forget to wash off
the blush. In hot weather, the epoxy will cure much faster. Not based on
anything formal, but I bet after a week in the summertime (80 to 90F
daytime), that epoxy will be pretty hard and ready to paint. Probably
cure even faster if you put a polyethylene tarp over it for warmth, but
you'd better be careful not to let it overheat from direct sun in that
case. I forget, but if it was my job I'd aim at keeping it under 110 or
120F.
I don't know anything about Interlux Brightside, but I've used
California Paints Acrylic Latex Troubleshooter Primer (from several
years ago) and it grips tenaciously. Can't even scrape it off without a
lot of trouble. Also seems to dry hard in a reasonable amount of time,
unlike some latex paints. Murphy's law says they've reformulated it.
Whatever primer and paint you use, do a test sample to avoid unpleasant
surprises.
week) to cure. If you're going to do scraping, which is often much nicer
than sanding, do it fairly soon after the epoxy job, the sooner the
easier after some reasonable amount of cure. Don't forget to wash off
the blush. In hot weather, the epoxy will cure much faster. Not based on
anything formal, but I bet after a week in the summertime (80 to 90F
daytime), that epoxy will be pretty hard and ready to paint. Probably
cure even faster if you put a polyethylene tarp over it for warmth, but
you'd better be careful not to let it overheat from direct sun in that
case. I forget, but if it was my job I'd aim at keeping it under 110 or
120F.
I don't know anything about Interlux Brightside, but I've used
California Paints Acrylic Latex Troubleshooter Primer (from several
years ago) and it grips tenaciously. Can't even scrape it off without a
lot of trouble. Also seems to dry hard in a reasonable amount of time,
unlike some latex paints. Murphy's law says they've reformulated it.
Whatever primer and paint you use, do a test sample to avoid unpleasant
surprises.
>Jason Stancil wrote:
>
>So i'm slathering, slinging and spreading epoxy in all the micro's
>nooks and crannies.(note to anyone on the verge of starting to
>build: coat your panels FIRST) I'll give it some sanding and then i
>wait.....? How long? Is a 3 week wait overkill to let the epoxy cure
>before priming the interior. I'd rather be safe than sorry as i'd
>like to get a good bond (interlux brightside primer).
>
>Also the boat is too big now, so i've got to get it out in the yard.
>Do i need to be concerned about the epoxy being exposed to the uv
>for a month.....or is that not enough time to do any significant
>damage.
>
>Thanks,
>Jason
>