Soda blasting
From Crankshaft Coalition Wiki
| Line 1: | Line 1: | ||
| − | + | ||
| + | [[Image:65RollsRoyceSodaBlasted.jpg|350px|thumb|A 1965 Rolls Royce after being soda blasted.]] | ||
Soda blasting is the use of sodium bicarbonate ("baking soda") or sodium bicarbonate-based materials as blast media for paint stripping. | Soda blasting is the use of sodium bicarbonate ("baking soda") or sodium bicarbonate-based materials as blast media for paint stripping. | ||
| Line 13: | Line 14: | ||
==Soda blasting procedure== | ==Soda blasting procedure== | ||
Soda blasting is done with a high volume, low pressure wet or dry blasting machine. Soda cleans surfaces not by abrasion, like conventional blasting media, but by the energy released by the tiny explosion that occurs when the soda particles contact the substrate. | Soda blasting is done with a high volume, low pressure wet or dry blasting machine. Soda cleans surfaces not by abrasion, like conventional blasting media, but by the energy released by the tiny explosion that occurs when the soda particles contact the substrate. | ||
| + | |||
| + | ==Soda blasters== | ||
| + | ''details on exactly how soda blasters work, and their various components goes here. could also include a list of manufacturers and possibly details on a DIY home soda blaster'' | ||
===Soda blasting medium=== | ===Soda blasting medium=== | ||
The sodium bicarbonate used as a blasting medium is chemically identical to "baking soda"; however, the blast medium typically uses larger particles. Some soda blasting media also include additives to prevent caking or help flow, such as tricalcium phosphate or calcium carbonate. | The sodium bicarbonate used as a blasting medium is chemically identical to "baking soda"; however, the blast medium typically uses larger particles. Some soda blasting media also include additives to prevent caking or help flow, such as tricalcium phosphate or calcium carbonate. | ||
| + | |||
| + | ====Examples of soda blasting medium==== | ||
| + | *[http://www.sodaworks.com/pages/products/NatruimSodaBlast.php Natrium] -- pure sodium bicarbonate, typical particle size of 290 microns. | ||
| + | *[http://www.sodablastsystems.com/ SodaClean Maintenance Plus] -- sodium bicarbonate with tricalcium phosphate and TFF: "treated free flowing additive". | ||
| + | *[http://armex.com/Products/products0100.aspx Various media produced by Armex, a subsidiary of Arm & Hammer]. | ||
===Soda blasting residue removal=== | ===Soda blasting residue removal=== | ||
| Line 31: | Line 40: | ||
*[http://www.holdtight.com/index.htm Holdtight 102] has been recommended for use in cleaning soda-blasted surfaces prior to application of primer. [http://www.nutechsodablasting.com/content/view/14/12/ More details on Holdtight 102]. | *[http://www.holdtight.com/index.htm Holdtight 102] has been recommended for use in cleaning soda-blasted surfaces prior to application of primer. [http://www.nutechsodablasting.com/content/view/14/12/ More details on Holdtight 102]. | ||
| − | *A vinegar and water solution is occasionally recommended, but has also been cautioned against]. | + | *A vinegar and water solution is occasionally recommended, but has also [http://www.hotrodders.com/forum/once-all-wiki-soda-blasting-162700-4.html#post1160993 been cautioned against]. ''(needs verification/confirmation)'' |
*Pressure washer and soap (Simple Green or Purple Power). While the car is wet, rinse with a hose. Do this at least 2-3 times. If any of the residue re-dries, water will not neutralize it, and it will have to be retreated. | *Pressure washer and soap (Simple Green or Purple Power). While the car is wet, rinse with a hose. Do this at least 2-3 times. If any of the residue re-dries, water will not neutralize it, and it will have to be retreated. | ||
*Dish soap with warm water and a red scuff pad. Scrub panels and rinse with hose three times. | *Dish soap with warm water and a red scuff pad. Scrub panels and rinse with hose three times. | ||
| + | |||
| + | ===Resources=== | ||
| + | *[http://www.fordmuscle.com/forums/body-paint-articles/485680-soda-blasting-budget.html Soda blasting on a budget] | ||
==Reasons in favor of using soda blasting== | ==Reasons in favor of using soda blasting== | ||
| Line 53: | Line 65: | ||
*Laborious, time-consuming steps required to prep parts after blasting. | *Laborious, time-consuming steps required to prep parts after blasting. | ||
*Only removes light flash [[rust]]. | *Only removes light flash [[rust]]. | ||
| − | *Because soda is so soft, it does not leave an anchor pattern. | + | *Because soda is so soft, it does not leave an anchor pattern. For reference, see this [http://www.reade.com/Particle_Briefings/mohs_hardness_abrasive_grit.html Mohs hardness scale abrasive comparison chart]. |
*Paint manufacturers advise against its use. | *Paint manufacturers advise against its use. | ||
*Can't re-use the medium after blasting. | *Can't re-use the medium after blasting. | ||
| + | *Soda Blasting will not allow for a high silica count paint to adhere to it after process is complete. | ||
Overall, soda blasting is probably not the best choice for the hobbyist or do-it-yourselfer. | Overall, soda blasting is probably not the best choice for the hobbyist or do-it-yourselfer. | ||
| + | ==Soda blasting and environmental-friendliness== | ||
| + | Soda blasting is frequently touted as an environmentally-friendly blast medium. | ||
| − | + | However, it's likely no more or less environmentally-friendly than media such as corn cobs, walnut shells, or crushed recycled glass, such as [http://www.trivitro.com/vitrogrit/vitrogrit.html VitroGrit]. Aggressively portraying soda blasting as "green" may qualify as [http://en.wikipedia.org/wiki/Green_marketing green marketing] or even borderline [http://en.wikipedia.org/wiki/Greenwashing greenwashing]. | |
| + | |||
| + | The used soda medium can be screened or filtered, and washed. The water-soluble soda can typically go down a conventional drain, leaving only the blasted particles behind. However, soda blasting medium may contain various flow additives that are less environmentally-friendly. | ||
| + | |||
| + | ==Published professional opinions on soda blasting== | ||
| + | *[http://www.southernpolyurethanes.com/tech%20sheets%20new/epOXY%202006.pdf Southern Polyurethanes]: | ||
| + | <blockquote> | ||
| + | ''"NEVER use SPI Epoxy over a Soda Blasted vehicle, Acid Etch/Wash Primer, Rust Converter or other Metal Treatments. NEVER!"'' | ||
| + | </blockquote> | ||
| + | |||
| + | This opinion is expanded upon in [http://spi.forumup.org/viewtopic.php?t=156&mforum=spi this discussion in the Southern Polyurethanes forums]. | ||
| + | |||
| + | |||
| + | <blockquote> | ||
''"We don't recommend sodium bicarbonate, because you can’t clean it out of the pores of the metal well enough."'' | ''"We don't recommend sodium bicarbonate, because you can’t clean it out of the pores of the metal well enough."'' | ||
| − | This post] contains secondhand email text purportedly from PPG, indicating that PPG does not warranty anything that has been soda blasted. ''(still waiting on the exact printed warranty text)'' | + | </blockquote> |
| + | |||
| + | *[http://www.hotrodders.com/forum/once-all-wiki-soda-blasting-162700-3.html#post1154575 This post] contains secondhand email text purportedly from PPG, indicating that PPG does not warranty anything that has been soda blasted. ''(still waiting on the exact printed warranty text)'' | ||
==Soda blasting and paint manufacturer warranty voiding== | ==Soda blasting and paint manufacturer warranty voiding== | ||
The use of soda blasting is thought to void the warranties of paint manufacturers. | The use of soda blasting is thought to void the warranties of paint manufacturers. | ||
| − | + | ===BASF=== | |
| + | BASF does not have a position specific to soda blasting. If this method is used, after all residue is removed, standard substrate preparation procedures must be performed. | ||
| + | ===DuPont=== | ||
| + | Awaiting response. | ||
| + | |||
| + | ===Kirker=== | ||
| + | Reprinted with permission: | ||
| + | |||
| + | <blockquote> | ||
| + | ''Kirker does not encourage the practice of using sodium bicarbonate as a means of preparing a surface for refinish work, especially when we’re talking to the non-professional refinisher, which is probably how the majority of your readers would describe themselves.'' | ||
| + | <br><br> | ||
''Sodium bicarbonate is a very reactive material. Therefore, it is imperative to remove all residue before applying any coating over the blasted surface. Should any trace residue remain on the vehicle (most typically this occurs in seams, along trim molding, etc.), there is a good chance it could react with the coating which results in several product performance issues, the most common being delamination. More specifically, the sodium bicarbonate reacts with acids and/or other materials in the coating, which creates a source for carbon dioxide. As the CO2 gasses out from beneath the forming film, it can cause blisters in the surface which potentially give way to more serious delamination issues.'' | ''Sodium bicarbonate is a very reactive material. Therefore, it is imperative to remove all residue before applying any coating over the blasted surface. Should any trace residue remain on the vehicle (most typically this occurs in seams, along trim molding, etc.), there is a good chance it could react with the coating which results in several product performance issues, the most common being delamination. More specifically, the sodium bicarbonate reacts with acids and/or other materials in the coating, which creates a source for carbon dioxide. As the CO2 gasses out from beneath the forming film, it can cause blisters in the surface which potentially give way to more serious delamination issues.'' | ||
<br><br> | <br><br> | ||
''For removing existing finishes to prepare for refinish work, there are better options than soda including organic media like walnut shells and corn cob or more aggressive abrasives like polyester bead. All of this considered, soda blasting can be done correctly with very good results, however we feel that is outweighed by the extra prep steps required and greater potential for delamination issues.'' | ''For removing existing finishes to prepare for refinish work, there are better options than soda including organic media like walnut shells and corn cob or more aggressive abrasives like polyester bead. All of this considered, soda blasting can be done correctly with very good results, however we feel that is outweighed by the extra prep steps required and greater potential for delamination issues.'' | ||
| + | <br><br> | ||
--Matt Panuska, VP Sales & Marketing for Kirker Automotive Finishes | --Matt Panuska, VP Sales & Marketing for Kirker Automotive Finishes | ||
| + | </blockquote> | ||
| + | |||
| + | ===PPG=== | ||
| + | Awaiting clarification and reprint rights. | ||
===Sherwin-Williams=== | ===Sherwin-Williams=== | ||
| − | The use of soda blasting does not nullify Sherwin Williams' | + | The use of soda blasting does not nullify Sherwin Williams' warranty. However, Sherwin WIlliams discourages its use. |
| + | |||
| + | Michael Pellett, a representative from Sherwin-Williams' Dallas Automotive Training Center [http://www.hotrodders.com/forum/once-all-wiki-soda-blasting-162700-4.html#post1160667 has stated]: | ||
| + | <blockquote> | ||
| + | ''Like most paint companies, we have experienced poor results in the past regarding this process as a surface preparation step. We actively discourage our customers from utilizing this process by explaining the potential problems and offering other alternatives.'' | ||
| + | </blockquote> | ||
| + | |||
| + | For more detail, see the text of the [[:Image:Sherwin-WilliamsWarranty.pdf|Sherwin Williams warranty]]. | ||
| + | |||
| + | ===Sikkens=== | ||
| + | Does not recommend Soda Blasting | ||
| + | |||
| + | ===SPI=== | ||
| + | A firsthand response from the owner of SPI is available [http://www.hotrodders.com/forum/once-all-wiki-soda-blasting-162700-4.html#post1160928 here]. | ||
| + | |||
| + | ===Valspar=== | ||
| + | Does not recommend Soda Blasting. | ||
| + | |||
| + | ==Related articles== | ||
| + | *[[Rust]] | ||
| + | *[[Media blasting]] | ||
| + | *[[Sandblasting]] | ||
| + | *[[Sanding]] | ||
| + | |||
| + | ==References== | ||
| + | *http://en.wikipedia.org/wiki/Sodablasting | ||
| + | *http://www.hotrodders.com/forum/once-all-wiki-soda-blasting-162700.html | ||
| + | *http://www.tristatesodablasting.com/faqs.html | ||
| + | *http://www.universalminerals.com/library/soda-blasting-overview.shtml | ||
| + | *http://www.balearicsodablasting.com/FAQ.html | ||
| + | *http://www.nutechsodablasting.com/content/view/3/7/ | ||
| + | *[http://siri.org/msds/f2/bdm/bdmjw.html Sodium bicarbonate MSDS] | ||
| + | *[http://armex.com/CaseStudies/casestudy0102.aspx Armex automotive and aerospace case studies] | ||
| + | |||
| + | ==External resources== | ||
| + | *[http://www.chesapeakesodaclean.com/media/PDF/CSC-SodaBlast_Auto-Paint-Strip.pdf Soda Blast - Automotive Paint Stripping] | ||
| − | + | [[Category:Body and exterior]] | |
| − | + | [[Category:Garage and shop]] | |
Your Privacy Choices