Rust
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#Apply jelly with 000 steel wool, rub it in, and allow it to set for a couple of minutes. Don't let it dry. | #Apply jelly with 000 steel wool, rub it in, and allow it to set for a couple of minutes. Don't let it dry. | ||
#Rub again with steel wool. Repeat a few times, and then clean the area. Dry it immediately. | #Rub again with steel wool. Repeat a few times, and then clean the area. Dry it immediately. | ||
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**It's caused by water in the air compressor line, as sand will harbor some moisture. Also, compressed air contains moisture. And, sand has salt in it. A moisture trap in the line should solve the problem with the water in the air line. | **It's caused by water in the air compressor line, as sand will harbor some moisture. Also, compressed air contains moisture. And, sand has salt in it. A moisture trap in the line should solve the problem with the water in the air line. | ||
**Even high grade epoxies and finishes are not 100% impermeable to water and air. | **Even high grade epoxies and finishes are not 100% impermeable to water and air. | ||
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| + | *Why do older cars rust more quickly? Theories are: | ||
| + | **Cars are more aggressively coated these days. Galvanizing (explain). | ||
| + | **Steel used in cars is of a higher quality these days. | ||
| + | **More salt is used on roads these days. | ||
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*Rust forms so quickly that if you are sand blasting, media blasting, etc., the surface rust will begin to form before you finish the job. | *Rust forms so quickly that if you are sand blasting, media blasting, etc., the surface rust will begin to form before you finish the job. | ||
*Many panels have seams, hems, and bends that are inaccessible by blasting, and hold moisture and rust. | *Many panels have seams, hems, and bends that are inaccessible by blasting, and hold moisture and rust. | ||
| + | *Body panels can be sand blasted. However, it must be done carefully (explain). The pressure of the sand hitting the body panels causes warpage. | ||
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Links to review: http://www.tfhrc.gov/pubrds/novdec98/laboratory.htm , http://www2.sherwin-williams.com/im/cs/cs-spring2003/feature-01.asp . | Links to review: http://www.tfhrc.gov/pubrds/novdec98/laboratory.htm , http://www2.sherwin-williams.com/im/cs/cs-spring2003/feature-01.asp . | ||
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