Editing Soda blasting
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[[Image:65RollsRoyceSodaBlasted.jpg|350px|thumb|A 1965 Rolls Royce after being soda blasted.]] | [[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. | ||
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==Soda blasting history== | ==Soda blasting history== | ||
− | Soda blasting was originally used as a method of stripping/cleaning industrial machinery. It was developed in the 1980's, and was most notably used | + | Soda blasting was originally used as a method of stripping/cleaning industrial machinery. It was developed in the 1980's, and was most notably used to restore the Statue of Liberty. |
Soda blasting crossed over into the automotive restoration field as somewhat of a miracle process, a misconception that had to be debunked. Although soda has its valid uses as a blast medium, it also has its own set of complexities and nuances that must be taken into consideration. | Soda blasting crossed over into the automotive restoration field as somewhat of a miracle process, a misconception that had to be debunked. Although soda has its valid uses as a blast medium, it also has its own set of complexities and nuances that must be taken into consideration. | ||
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*Does not abrade or impinge substrate. | *Does not abrade or impinge substrate. | ||
*It's water-soluble, and can typically be washed down a conventional drain. | *It's water-soluble, and can typically be washed down a conventional drain. | ||
− | *The soda blasting residue can be temporarily left on the substrate, as a [[rust]] | + | *The soda blasting residue can be temporarily left on the substrate, as a [[rust]] inhibiting protective coating. |
*Sodium bicarbonate has a well-known chemistry, and is widely considered safe to use. | *Sodium bicarbonate has a well-known chemistry, and is widely considered safe to use. | ||
*You can soda blast lightly to leave the body filler intact, and then go over it again to remove all filler. | *You can soda blast lightly to leave the body filler intact, and then go over it again to remove all filler. | ||
− | *No pre-cleaning required ( | + | *No pre-cleaning required (Prior to blasting, traditional blasting media may require the surface to be thoroughly cleaned to remove salt, carbon, or grease.) |
*Allows for easier detection of surface flaws. (Traditional abrasive media may peen cracks closed, or fill them with abrasive, whereas soda cleans out the cracks). | *Allows for easier detection of surface flaws. (Traditional abrasive media may peen cracks closed, or fill them with abrasive, whereas soda cleans out the cracks). | ||
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*Only removes light flash [[rust]]. | *Only removes light flash [[rust]]. | ||
*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]. | *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]. | ||
− | * | + | *May void warranties with paint manufacturers. |
*Can't re-use the medium after blasting. | *Can't re-use the medium after blasting. | ||
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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. | ||
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This opinion is expanded upon in [http://spi.forumup.org/viewtopic.php?t=156&mforum=spi this discussion in the Southern Polyurethanes forums]. | This opinion is expanded upon in [http://spi.forumup.org/viewtopic.php?t=156&mforum=spi this discussion in the Southern Polyurethanes forums]. | ||
− | + | *[http://www.search-autoparts.com/searchautoparts/article/articleDetail.jsp?id=130652 John Hughes, Ford Motor Company refinish technical expert]: | |
<blockquote> | <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."'' | ||
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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. | ||
− | === | + | ===PPG=== |
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Awaiting response. | Awaiting response. | ||
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===Sherwin-Williams=== | ===Sherwin-Williams=== | ||
− | The use of soda blasting does not nullify Sherwin Williams' warranty. However, Sherwin WIlliams discourages its use. | + | The use of soda blasting does not nullify Sherwin Williams's warranty. However, Sherwin WIlliams discourages its use. |
− | + | A representative from Sherwin-Williams [http://www.hotrodders.com/forum/once-all-wiki-soda-blasting-162700-4.html#post1160667 has stated]: | |
<blockquote> | <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.'' | ''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> | </blockquote> | ||
− | For more detail, see the text of | + | For more detail, see the text of [[:Image:Sherwin-WilliamsWarranty.pdf|the Sherwin Williams warranty]]. |
===Sikkens=== | ===Sikkens=== | ||
− | + | Awaiting contact. | |
===SPI=== | ===SPI=== | ||
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===Valspar=== | ===Valspar=== | ||
− | + | Awaiting response. | |
==Related articles== | ==Related articles== | ||
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*[http://armex.com/CaseStudies/casestudy0102.aspx Armex automotive and aerospace case studies] | *[http://armex.com/CaseStudies/casestudy0102.aspx Armex automotive and aerospace case studies] | ||
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[[Category:Body and exterior]] | [[Category:Body and exterior]] | ||
[[Category:Garage and shop]] | [[Category:Garage and shop]] |