To all: What is the best product for sealing block walls prior to painting? Is there a product sold in Mex. comprable to products sold in the US. Let
me know your experiences block walls and concrete flat roofs. Do you think it necessary?
thanks brianlonglegsinlapaz - 6-7-2008 at 10:49 AM
eskel, I use the black tar-baser sealer below soil for protection against salt & water, and from ground level up, it's what's available in your
specific area. Here in La Paz I used Pittsburgh Paint products....a 5-gallon bucket of the sealer is around $900 pesos. My limited experience with
Doal, Comex & other Mexican paints has taught me to spend the extra money to apply good quaility sealer & paint in the first place & not
have to repaint for 5-8 years! All Mexican paint I've tried has been very chalky & rubs off & even partially washes off with rain.
For my roofs, I've used a flexible white waterproofing, not sure of the exact product name.....but if nobody else volunteers it, I'll have to do some
research & get back to you. I think you're either at the mercy of what specific products are available locally or haul it down from the states
with you.Pescador - 6-8-2008 at 09:51 AM
Comex makes one of the best concrete sealers in the market. It works as well or better than Kilz. It is a latex based product and is diluted
according to your base material and requires two coats to effectively do the job.sloopy - 6-10-2008 at 08:04 AM
Is it possible to use that rubbery stuff one uses for a travel trailer roof down there? I put a coat on my trailer roof about 3 years ago and it's
still in great shape. Handles direct sunlight and heavy rains very well. Much cooler, too. It's white and I got a bucket at an RV store for about $80
USD. Curious......bajaguy - 6-10-2008 at 08:18 AM
Elskel, you don't mention where you are located. I have a new stucco covered block wall and I am going to use BEHR Basement & Masonry
waterproofing paint. It can be tinted to various colors and is acailable at Home Depot. It's about $23 a gallon.
Thanks for the replys. I am located south of Todos Santos in Pescadero. The block casita is plastered and is almost ready for paint. I want to seal
for moisture prior to painting.
Thanks Brianbajaguy - 6-10-2008 at 07:43 PM
The BEHR paint I mentioned above does not need a primer coat or sealerDiver - 6-11-2008 at 05:23 AM
Quote:
Originally posted by elskel
I want to seal for moisture prior to painting.
Thanks Brian
You do want to let the stucco or concrete dry and cure before painting or sealing or you will be in for some pealing from moisture behind your sealer.
I normally wait at least 2 weeks.bajaguy - 6-11-2008 at 06:29 AM
Behr was recommending a 30 day cure period. Also, the Behr paint is somewhat elastomeric so it will hide the small hairline cracks that may develop in
the stucco.oladulce - 6-11-2008 at 09:29 AM
Hi elskel-
Wow, you're progressing rapidly (for a Mex project). It seems like you were asking property purchase questions just the other day. Way to go!
Here's my experience. For flat concrete roofs, the white paint=on product that's available down there has worked great. I'm with Longlegs because I
can picture the bucket but don't recall the name. U2u me if you want the specific brand and I'll ask.
We've had a few heavy downpours and the only water evidence on the interior ceiling was where we had to break the seal to drill through the roof for
some vital wiring they "missed" during construction. Once we slapped on some more of the white stuff around the spot, the leak stopped.
For the "estucco" plastered, block walls of our buildings I used these Dunn Edwards products and have been very pleased.:
Primer- "EFF-STOP -Acrylic Masonry Primer/Sealer"
"EFF-STOP® is a premium epoxy fortified acrylic primer/sealer for interior and exterior masonry. EFF-STOP provides very good resistance to
efflorescence and good alkali resistance on properly cured tilt-up concrete, poured-in-place concrete, stucco and block."
I was concerned that the minerals leaching out of the cementitious products would cause the paint to peel off in a year or 2 so I tried this product.
So far it has been an excellent base coat under the paint. We use it as the base coat for interior and exterior block/ with plaster walls.
They can tint the white color closer to your final paint color. It rolls on easily, but buy a little more than you calculate you'll need because the
plaster soaks it up like a sponge.
Paint- (Exterior walls) Dunn Edwards "ENDURACRYL"
"ENDURACRYL® is a premium acrylic low sheen enamel paint formulated to provide superior durability, color retention, on masonry, concrete, block,
stucco, wood, and exterior metal .... produces a flexible, exceptionally smooth finish which shields the surface from the elements that cause film
failure..."
I like this paint sheen better than the flat paint I've used in the past. The walls stay cleaner looking in this dirty environment but it's not shiny
and looks better on stucco/ plaster than the flat paint I've used before. We've got a dark/rich color than shows no signs of fading after 2 summers
(the flat Ben Moore paint I had used faded in less than a year). You can wet the walls and see the water beading up on the painted surfaces= no water
seepage to the interior during heavy rains.
We needed less paint than the D.E. calculations (but don't forget to get extra primer!) and the paint applied easily with 2 coats .
You asked about "sealing" your plastered walls and I'm not sure if you're concerned about sealing the salts in to protect
the painted surfaces, or keeping water out. Either way, I would highly recommend these products to accomplish both.
Priming as Hurricane John weather approaches Sept 06
oladulce - 6-11-2008 at 09:40 AM
sloopy asked about the RV roof sealer product for a concrete roof and I just looked at the can of stuff in the garage that we put on our camper roof.
It says it's "rubberized" and specifically for aluminum/metal surfaces and it seems like it's a very specific product for that application.
You'd spend an unecessary fortune on that product for the amount you'd need on a Mexican casa, and I'd been concerned that it wouldn't stick to the
plaster/stucco on the roof. The product I mentioned above is specifically for this purpose, you can get it in BC or BCS, and seems to work very well
and cost less than the RV coating.
Sealer
elskel - 6-12-2008 at 10:01 PM
Cindy: Thanks for the good info. How are things in San Jaunico? Kathleen and I are moving along on our project. Hope to be finished and take the kid's
down for Christmas. The obra negra should be finished in two weeks and start the finish work 2nd week of July.
Take care Brianwoody with a view - 6-12-2008 at 10:06 PM
whatever you do do not water down your paint. use it as is out of the bucket..... your contractors/laborers will want to make it go farther but deny
them. elastomeric is a good thing.CaboRon - 6-17-2008 at 09:47 AM
Quote:
Originally posted by woody in ob
whatever you do do not water down your paint. use it as is out of the bucket..... your contractors/laborers will want to make it go farther but deny
them. elastomeric is a good thing.
In fact you will have to watch them ... even if they agree to not water it down.... they will do it anyway when you are gone.
The paint is so watered down on my casa that when it rains the color changes from white to the original yellow.
