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Exterior paint on interior? Nubs 02-20-2008
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Posted by cshenk on February 21, 2008, 4:06 am
"Nubs" wrote

> The garage is under the house, has concrete block about half way up, and
> the rest is drywalled. Originally, the builder rolled/sprayed on a thin
> coat of mix, and dragged a roller through it.

> I had painted interior paint on the walls. Now, since washing the vehicles
> inside after many years, the mud is peeling in places from the drywall.
> The garage is not heated, but stays warmer than the outside air
> temperature.
>
> Can I use exterior paint on the drywall? Do I have to use a primer on bare
> drywall where the mud has come off? Should I primer all areas, even the
> area where the mud/texture has not come off?

For a long lasting finish, yes you need to prime the drywall. All of it for
the best finish. Be sure all the mud is off but dont get it too wet in the
process. Let completely dry, then prime and use a paint over that meant to
be 'washed' (exterior will do)

> One last point. Can I use exterior paint on the concrete block? Should I
> prime the block, which has never been painted?

Yes, and again prime first. You may find the best to use here is stuff sold
for basement cinderblock. It's thicker and easier to add to a pourous
concrete block. It will likely take 2 coats with a thicker roller.

If a brand name helps, last time I was involved with this, Mom got only
Sherman Williams (sold at sears). I am sure there are others as good, but
this one worked for us in a somewhat similar need.



Electric Radiant Heat 468x60
Posted by Joseph Meehan on February 21, 2008, 9:54 am
The problem I can see is that many outdoor paints are self cleaning.
That is they are designed to slowly erode and have the rain wash off a
little each time. Inside you are likely to end up with a powder on the
surface. Someone brushing against it will find it will rub off onto their
clothing.

You need to check with knowledgeable staff. You can find good and bad
staff anywhere, but you are more likely to find knowledgeable staff at a
real paint store.

--
Joseph Meehan

Dia 's Muire duit



> I want to paint the interior walls of my garage.
>
> The garage is under the house, has concrete block about half way up, and
> the rest is drywalled. Originally, the builder rolled/sprayed on a thin
> coat of mix, and dragged a roller through it.
>
> I had painted interior paint on the walls. Now, since washing the vehicles
> inside after many years, the mud is peeling in places from the drywall.
> The garage is not heated, but stays warmer than the outside air
> temperature.
>
> Can I use exterior paint on the drywall? Do I have to use a primer on bare
> drywall where the mud has come off? Should I primer all areas, even the
> area where the mud/texture has not come off?
>
> One last point. Can I use exterior paint on the concrete block? Should I
> prime the block, which has never been painted?
>
> Many thanks.
>
>
>

Posted by Buck Turgidson on February 21, 2008, 7:41 pm
First, I'd probably stop washing the cars in the garage. That might be the
root cause of the problem.

Secondly, I'd go with an oil primer, and an oil satin. Benjamin Moore
probably still carries oil-base in gallons.



Posted by larry moe 'n curly on February 22, 2008, 3:50 am


Nubs wrote:

> I want to paint the interior walls of my garage.

If it wasn't the garage, I'd worry about the anti-fungal chemicals in
exterior paint.

I searched for "exterior paint indoors" and found this from the
PaintQualityInstitute.com:

"Use caution in using exterior latex paint indoors because: A.
exterior
paints may have more odor than you want B. they may dry more
slowly,
and be softer than you want C. the flow-out of brushmarks may not
be
as good as you would get with an interior paint. D. check the
product
label and directions carefully, in case a product's directions state
that
it should not be used indoors."

House-painting-info.com said:

"Paints that are dedicated for exterior use have concentrated
mildewcides and fungicides that could have heath risks if used
indoors. Plus, exterior paints have more VOC's, which means
the paint will have a potent smell when compared to its interior
counterparts.

"Exterior paints, especially acrylics, are designed to fast dry
and resist the worst that the environment can offer. Because
of this, exterior paints won't easily flow out smoothly on a
surface and will more difficult to use. Many quality interior
paints have the same great attributes as exterior paints without
the health risks or problems of exterior paints."

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