Ballroad Posted June 30, 2018 Posted June 30, 2018 Sorry no photos,..yet..I found that a quick blasting of baking soda through my Milton solvent sprayer hooked up my out side air compressor works real nice for knocking off the shiny plastic finish on the undercarriage after removing the ejector pin marks on my 1961 Ford Galaxie. Will do on the rest of it prior to priming nice echeted finish...... thanks
Tom Geiger Posted June 30, 2018 Posted June 30, 2018 Just remember to wash everything really good. Baking soda is pretty much salt.
Ace-Garageguy Posted June 30, 2018 Posted June 30, 2018 16 minutes ago, Tom Geiger said: ... Baking soda is pretty much salt. No. Baking soda is sodium bicarbonate. NaHCO3 Sodium, hydrogen, carbon and oxygen Salt is sodium chloride. NaCl Sodium and chlorine Two ENTIRELY different chemicals, with different properties and uses. AND: Baking soda is routinely used as a blasting medium on real car-parts, as it doesn't cause as much heat distortion and pitting as more aggressive sand and glass blasting media. It also makes an excellent NON-SCRATCHING cleaner for plastic and glass. Great for coffee pots and plastic coffee maker guts.
Ballroad Posted June 30, 2018 Author Posted June 30, 2018 Will definitely wash like always before priming and painting, I don't have a small sandblasting cabinet, so I just stick the suction line in the baking soda and let it fly, makes a little mess but the wind blows it away. I thought the extra tooth in the plastic would make for a good paint bond..
Tom Geiger Posted June 30, 2018 Posted June 30, 2018 24 minutes ago, Ace-Garageguy said: No. Baking soda is sodium bicarbonate. NaHCO3 Sodium, hydrogen, carbon and oxygen Salt is sodium chloride. NaCl Sodium and chlorine Two ENTIRELY different chemicals, with different properties and uses. AND: Baking soda is routinely used as a blasting medium on real car-parts, as it doesn't cause as much heat distortion and pitting as more aggressive sand and glass blasting media. It also makes an excellent NON-SCRATCHING cleaner for plastic and glass. Great for coffee pots and plastic coffee maker guts. It still absorbs moisture from the atmosphere. Which is why I recommended washing before painting. I have models that used baking soda as part of the rust job (recommended to me back then) and at summer at the peak of humidity there's a damp spot.
SfanGoch Posted June 30, 2018 Posted June 30, 2018 Comet or Ajax and scrubbing with a stiff brush works as well. And, it leaves the parts sparkling clean.
Ace-Garageguy Posted June 30, 2018 Posted June 30, 2018 (edited) 9 minutes ago, SfanGoch said: Comet or Ajax and scrubbing with a stiff brush works as well. And, it leaves the parts sparkling clean. Yup. THE BEST, method, period. That's the only method I've used...for years...after trying everything else. A toothbrush is good, and hot water. Make a paste of your cleaner and water, go to it. Work a small area at a time, and in just a few minutes, your model is very evenly and perfectly scuffed. Rinse thoroughly. Done. Besides getting into all the little nooks and crannies that sanding or Scotch-Brite pads miss (and you risk softening details with sanding), it also removes any residual mold lubricants that might still be on new plastic parts (which can contribute to poor adhesion and fisheyes). Edited June 30, 2018 by Ace-Garageguy
Ballroad Posted June 30, 2018 Author Posted June 30, 2018 That sounds like the way to go, it's like me to try to reinvent the wheel ?
Deano Posted June 30, 2018 Posted June 30, 2018 3 hours ago, Ace-Garageguy said: No. Baking soda is sodium bicarbonate. NaHCO3 Sodium, hydrogen, carbon and oxygen Salt is sodium chloride. NaCl Sodium and chlorine Two ENTIRELY different chemicals, with different properties and uses. AND: Baking soda is routinely used as a blasting medium on real car-parts, as it doesn't cause as much heat distortion and pitting as more aggressive sand and glass blasting media. It also makes an excellent NON-SCRATCHING cleaner for plastic and glass. Great for coffee pots and plastic coffee maker guts. Bill, often, when I read your posts, my reaction is "This dude has his stuff together!" but when you blow goober chunks you do it in spades! Sodium chloride is >A< salt. Potassium chloride is a salt. Sodium bicarbonate is also a salt. Sodium bicarbonate, commonly known as baking soda, is a chemical compound with the formula NaHCO₃. It is a salt composed of sodium ions and bicarbonate ions. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. Wikipedia It is also hygroscopic (absorbs water) so it's probably not the best thing to paint over (or leave in contact with that freshly blasted metal.)
Ace-Garageguy Posted June 30, 2018 Posted June 30, 2018 15 minutes ago, Deano said: Bill, often, when I read your posts, my reaction is "This dude has his stuff together!" but when you blow goober chunks you do it in spades! Sodium chloride is >A< salt. Potassium chloride is a salt. Sodium bicarbonate is also a salt. Sodium bicarbonate, commonly known as baking soda, is a chemical compound with the formula NaHCO₃. It is a salt composed of sodium ions and bicarbonate ions. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. Wikipedia It is also hygroscopic (absorbs water) so it's probably not the best thing to paint over (or leave in contact with that freshly blasted metal.) I figured I'd get this if anybody who knew much was paying attention (and I left out the ion stuff for the sake of simplicity). My response was to the statement that "baking soda is pretty much salt." That implies table salt to me. He did NOT say baking soda (sodium bicarbonate) is A salt...which I know. Two entirely different meanings here, and two entirely different chemical compounds. Not interchangeable, and neither one is "pretty much" the other one. I stand by my statement. And baking soda IS routinely used as a blasting medium for real cars and parts. Though problems have been reported with painting soda-blasted cars, they are invariably caused by poor cleaning and prep AFTER blasting...which is 100% necessary after ANY paint stripping procedure. https://www.dlkautoparts.com/index.php/soda-blasting
Deano Posted July 1, 2018 Posted July 1, 2018 1 hour ago, Ace-Garageguy said: I figured I'd get this if anybody who knew much was paying attention (and I left out the ion stuff for the sake of simplicity). My response was to the statement that "baking soda is pretty much salt." That implies table salt to me. He did NOT say baking soda (sodium bicarbonate) is A salt...which I know. Yep, one little letter makes all the difference! ;-) Two entirely different meanings here, and two entirely different chemical compounds. Not interchangeable, and neither one is "pretty much" the other one. I stand by my statement. And baking soda IS routinely used as a blasting medium for real cars and parts. Though problems have been reported with painting soda-blasted cars, they are invariably caused by poor cleaning and prep AFTER blasting...which is 100% necessary after ANY paint stripping procedure. Yep! Hence my comment about not leaving it in contact with the freshly blasted metal.
Oldcarfan27 Posted July 1, 2018 Posted July 1, 2018 Anybody got any popcorn, this is entertaining! ? "Goober chunks" made me laugh.
peteski Posted July 2, 2018 Posted July 2, 2018 On 6/30/2018 at 2:57 PM, Tom Geiger said: Sodium Bicarbonate still absorbs moisture from the atmosphere. Which is why I recommended washing before painting. I have models that used baking soda as part of the rust job (recommended to me back then) and at summer at the peak of humidity there's a damp spot. That is why I will never use it as a CA glue (super-glue) accelerator. If some of it remains free of the CA glue within the joint and remains open to the ambient air, it can start absorbing water from the air and leaching out of the joint. I know it is off-topic here, but I had to mention it.
Tom Geiger Posted July 2, 2018 Posted July 2, 2018 9 hours ago, peteski said: That is why I will never use it as a CA glue (super-glue) accelerator. If some of it remains free of the CA glue within the joint and remains open to the ambient air, it can start absorbing water from the air and leaching out of the joint. I know it is off-topic here, but I had to mention it. Pretty much on topic! Note that people who want to use it as a blasting media will have the same issue if they don't clean the model super well. Are you sure you got it all out of the seams? Out of the cracks between two glued parts? Otherwise it can come back to haunt you.
dartman Posted July 16, 2018 Posted July 16, 2018 It is in fact used on real car parts.I use it all the time on carburetors and anything I need to clean that the regular sand or glass beads would plug up.
SfanGoch Posted July 16, 2018 Posted July 16, 2018 Trisodium phosphate can also be used to clean and degrease polystyrene, leaving no residue. It's also great degunking carburetors and degreasing firearms parts in preparation for parkerizing them.
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