On my thread about insulating a steel building.... Wingspread7 writes>70% alcohol has ruined many a paint job prep. The remainder of that 30% is water and oil (rubbing alcohol). Can you please elaborate??? I thought that the "70 Percent Isopropyl Alcohol" was 70 alcohol and the remaining was 30 percent water. I did not know there was some kind of oil in the mixture. Is this not a good product to clean off painted/primed metal to prepare to paint or adhere some kind of adhesive??? Inquiring mind wants to know...
Some types/brands of rubbing alcohol does contain perfume oils.....not all though. From the interwebs.... The chemical composition of rubbing alcohol Updated January 10, 2019 One of the types of alcohol you can buy over the counter is rubbing alcohol, which is used for disinfection and may be applied to the skin to produce a cooling effect. Do you know the chemical composition of rubbing alcohol? It is a mixture of denatured alcohol, water, and agents added to make the alcohol unpalatable to drink. It may also include colorants. There are two common types of rubbing alcohol. ethyl alcohol or ethanol with water. Ethyl alcohol is naturally less toxic than isopropyl alcohol. In fact, it is the alcohol that naturally occurs in wine, beer, and other alcoholic beverages. However, the alcohol is denatured or made undrinkable in rubbing alcohol, both to control its use as an intoxicant and because the alcohol has not been purified to make it safe to drink. In fact, in the US, additives make it as toxic as isopropyl alcohol. using ethanol must conform to Formula 23-H, which specifies it consists of 100 parts by volume of ethyl alcohol, 8 parts by volume of acetone, and 1.5 parts by volume of methyl isobutyl ketone (MSDS sheet). The remainder of the composition includes water and denaturants and may include colorants and perfume oils. Rubbing alcohol made using isopropanol is regulated to contains at least 355 mg of sucrose octaacetate (MSDS sheet) and 1.40 mg of denatonium benzoate per 100 ml volume. Isopropyl rubbing alcohol also contains water, stabilizer and may contain colorants. Rubbing Alcohol Toxicity All rubbing alcohol manufactured in the US is toxic to ingest or inhale and can cause excessively dry skin if used often. In fact, if you read the product label, you'll see there is a warning against most of the common uses of rubbing alcohol. All types of rubbing alcohol, regardless of their country of origin, are flammable. Formulations closer to 70% are less likely to catch fire than rubbing alcohol that contains a higher percentage of alcohol.
The paint companies market "wax and grease remover" to clean metal and paint prior to painting. Why are you not using one of them?
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