Posted by kylemorley on February 25, 2013 at 08:44:52 from (96.61.93.1):
I have been looking around for a cost effective alternative to short-lived alkyd tractor paint, for quick-and-dirty tractor and implement paint jobs, and trying to figure out whether the urethane-modified alkyds are worth the extra $. This is not easy, because while there are industry-standard tests for durability many paint manufacturers just won't share the results.
I just stumbled on some interesting test results from Coronado which allow direct comparison. Coronado (which is now owned by B Moore) doesn't make any tractor or auto paints, but makes a full range of medium and heavy duty industrial paints that should serve the purpose equally well, most of which are available in custom colors. The results are interesting - the accelerated weathering result is probably the most significant for tractors and implements which will live outdoors.
Plain alkyd
Accelerated Weathering - 500 hr. (higher is better) - 65%
Abrasion (lower is better) - 140 mg
Salt Fog - Rating 9 0.04%
Urethane-modified alkyd
Accelerated Weathering - 500 hr. (higher is better) - 70%
Abrasion (lower is better) - 120 mg
Salt Fog - Rating 10 0.01%
2-Part "real" aliphatic urethane
Accelerated Weathering - 500 hr. (higher is better) - 95%
Abrasion (lower is better) - 44 mg
Salt Fog - Rating 10 0.01%
I'm not sure exactly what each number means but you get the idea - urethane-modified alkyd is a fairly small step up from alkyd, but real 2-part urethane is a huge one. The results for urethane-modified alkyd should be very similar to what one would get from an alkyd with the hardener.
I've found the Coronado 2-part on the net for about $65 a gallon custom mixed, not much more than most urethane-modified alkyds, which means it should be possible to paint a tractor using the two part for only $50 or so more than using "tractor paint" alkyd
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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