Date
1 - 11 of 11
Well, that's . . . odd
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rwitt_2000
Tim O'Connor wrote:
<snip> I have a couple dozen opened bottles of Scalecoat and I routinely put thinned paint back in the bottle. They only gel when the cap is not airtight. Floquil bottles seem to have the best airtight seals. and Aidrain Bridgeman wrote: "Once a can of POR-15 is opened you have to use it all in the same session, but if you add a whiff of propane to the top of the can before you seal it it prolongs the shelf life so that the contents are still liquid several weeks later." I am missing something because doesn't the old trick of storing the paint containers upside down still make an "air-tight" seal; although it cannot prevent air from entering the container upon opening. Replacing the "air" with an inert gas such as nitrogen would probably work better than propane. Bob Witt Indianapolis, Indiana |
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Aidrian Bridgeman-Sutton <smokeandsteam@...>
Car restorers use a product called POR-15 which seems to be a full
size version of Scalecoat (or at least reacts the same way when it is exposed to air). Once a can of POR-15 is opened you have to use it all in the same session, but if you add a whiff of propane to the top of the can before you seal it it prolongs the shelf life so that the contents are still liquid several weeks later Try this at you own risk and don't turn the gas valve on full unless you want paint everywhere... Aidrian |
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Schuyler Larrabee
One thing I've done to try to extend the life of Scalecoat 1 in the past is, when I'm ready to close
up the bottle, dropper some fresh thinner on top of the paint, and then store it without shaking it. It just goes on a shelf and sits there until next time, and I've had good luck with that. SGL Disagree all you like, I was sharing my experiences. Now there is also the possibility thathumidity levels could be factor in this as well.bottle and that a custom painter I know in Winnipeg as also urged me to follow that procedure.wrote: unused thinned paint to return into the bottle of "fresh" paint.Even if the bottle is well sealed. E-mail message checked by Spyware Doctor (6.0.1.441) Database version: 6.12650 http://www.pctools.com/en/spyware-doctor-antivirus/ |
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Earl T. Hackett <hacketet@...>
Many lacquers are formulated with what are called 'drying oils.' These are oils that polymerize on exposure to oxygen. Linseed oil is the most well known, but there are several others. Every time you open the bottle you let some oxygen in and eventually you will cause the oil to polymerize, making the paint into a gel. If you seal the bottle well you can extend the life of the paint significantly. I know one individual who squirts some nitrogen into the bottle just as he's capping it, but even those precautions will not prevent it from gelling eventually.
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As for acrylic paints, they are a very different animal. They consist of small droplets of paint suspended in water. There is a careful balance of surfactants in the water to keep the particles from coalescing (sticking together). When you dilute an acrylic, you upset this balance and the particles start to stick when they bump into each other. During a painting session you won't notice any change, but let the paint sit for a couple of days and you'll find all the solids glopped on the bottom of the jar. Most manufacturers sell a thinner for their acrylics that has the proper balance of solvents and surfactants. There's no guarantee, but you will have a much better chance of not messing up a bottle of paint if you use the recommended thinner. Otherwise, just thin what you need and toss the left overs. --- In STMFC@..., "Schuyler Larrabee" <schuyler.larrabee@...> wrote:
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pierreoliver2003 <pierre.oliver@...>
Disagree all you like, I was sharing my experiences. Now there is also the possibility that humidity levels could be factor in this as well.
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I do know that Scalecoat strongly recommends not to return thinned paint back to the original bottle and that a custom painter I know in Winnipeg as also urged me to follow that procedure. Pierre Oliver --- In STMFC@..., Tim O'Connor <timboconnor@...> wrote:
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Schuyler Larrabee
Tim, thanks for the reply.
What do you mean, "flat" lacquer? You mean a lacquer based flat coat?Right, I know that. Actually, the "vehicle," not the thinner. When it evaporates, the other substance can gel. I've lost many paints to this -- in all casesThe top was tight, I'm fairly obsessive about that. A nice pair of crescent pliers are on the painting booth Do you mean that it solidified instantly when you inserted the tubeYes. Are you sure it wasn't already jelled? Yes, it shook up just fine. I had to shake it for QUITE some time, as the solids (the flatting agent) was settled in the bottom of the bottle big time. I've only seen "instant gel" form when combining incompatible liquids, likeWell, I suppose that's possible. I had not been painting before this episode. I was cranking everything up just to apply the flat coat. IF, that's IF, the contamination came from the tube, it was thoroughly dry. Do you (plural for the list) have separate tubes (and airbrushes?) for acrylic vs. solvent based paint? SGL well, sort of crystallized. Not truly into a solid mass, but it kind of jelled or something. I pitched E-mail message checked by Spyware Doctor (6.0.1.441) Database version: 6.12650 http://www.pctools.com/en/spyware-doctor-antivirus/ |
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Schuyler Larrabee
Pierre, I agree with Tim's response on this.
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SGL -----Original Message-----thinned paint to return into the bottle of "fresh" paint.well, yearssort of crystallized. Not truly into a solid mass, but it kind of jelled or something. I pitched <http://www.pctools.com/en/spyware-doctor-antivirus/>ago. I've used it let down by half with quality lacquer thinner, so it's lasted me a very long <http://www.pctools.com/en/spyware-doctor-antivirus/> E-mail message checked by Spyware Doctor (6.0.1.441) Database version: 6.12650 http://www.pctools.com/en/spyware-doctor-antivirus/ |
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Pierre
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I totally disagree with that statement. I have a couple dozen opened bottles of Scalecoat and I routinely put thinned paint back in the bottle. They only gel when the cap is not airtight. Floquil bottles seem to have the best airtight seals. I have found that your statement is correct when it comes to acrylic paints. It's best to toss out the thinned paint while exposing the original bottle to as little air as possible by opening it only briefly to remove some. Tim O'Connor Schulyer, |
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What do you mean, "flat" lacquer? You mean a lacquer based flat coat?
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The lacquer in that case is just the thinner. When it evaporates, the other substance can gel. I've lost many paints to this -- in all cases because the cap is not airtight. Do you mean that it solidified instantly when you inserted the tube into the bottle? Are you sure it wasn't already jelled? I've only seen "instant gel" form when combining incompatible liquids, like acrylic with something that it reacts to chemically. Maybe your tube was contaminated? Tim O'Connor Not long ago, I went to use some flat lacquer I have used with great success in the past. When I |
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pierreoliver2003 <pierre.oliver@...>
Schulyer,
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What you've described is exactly what happens to Scalecoat paints if you allow thinner or unused thinned paint to return into the bottle of "fresh" paint. Even if the bottle is well sealed. Pierre Oliver --- In STMFC@..., "Schuyler Larrabee" <schuyler.larrabee@...> wrote:
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Schuyler Larrabee
I am sure that there are many on this list with vastly more experience with paints than I . . .
Not long ago, I went to use some flat lacquer I have used with great success in the past. When I put the snorkel (or whatever that tube-in-the-cap is called) into the bottle, the lacquer, uh, well, sort of crystallized. Not truly into a solid mass, but it kind of jelled or something. I pitched the bottle and gave the snorkel a very serious cleaning. Does lacquer ever go bad? I've had this stuff a very long time, having bought a gallon of it years ago. I've used it let down by half with quality lacquer thinner, so it's lasted me a very long time. I have sold off some of it in small cans to other modelers who've expressed that they were happy with it. And I've never had any bad interaction show up after years of exposure. I'd buy more if it just needs to be fresh. Thoughts? SGL La vita e breve, mangiate prima il dolce! E-mail message checked by Spyware Doctor (6.0.1.441) Database version: 6.12650 http://www.pctools.com/en/spyware-doctor-antivirus/ |
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