Basically the question in the title as I'm not sure if moisture / water can penetrate through polyurethane.
Maybe someone has some insight or experience with this. Is polyurethane water resistant? Is water able to go through it?
Also another question: Is polyurethane biodegradable and does it corrode?
Thanks.
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05-08-2021, 05:28 PM #1
Is polyurethane coated cast iron going to rust?
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05-08-2021, 06:47 PM #2
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05-08-2021, 07:27 PM #3
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05-08-2021, 07:39 PM #4
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05-08-2021, 07:42 PM #5
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05-08-2021, 08:11 PM #6
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05-08-2021, 08:16 PM #7
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05-09-2021, 10:35 AM #8
That, and any time there is a seam it's never 100% unpermeable if submerged. However unless you live in a flood zone, probably ok.
That said, I would advise against leaving any kind of equipment exposed to the elements. I get the idea of an outdoor gym and think it'd be cool, but be realistic about the longevity and maintenance needs of even the highest quality equipment in those conditions.
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05-09-2021, 10:57 AM #9
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05-10-2021, 04:44 AM #10
I thought about buying cast iron plates but lets do the math: polyurethane plates cost 4€ per kg and cast iron plates (with handles) cost 2,9€ per kg.
The cast iron plates I'm referring to can be seen in the picture I attached (since I can't post links yet).
The difference per kg is 1,1€ which isn't really much money saved to be honest since polyurethane is an expensive material too. I guess it depends how much longer the lifespan is with the polyurethane compared to painted cast iron. The cast iron plates are fine pored (don't know if you can say that in English) which means it should rust somewhat slower.
One thing though, cast iron is loud. It will clang and make noise when putting the weight on and off and while lifting. Polyurethane plates will only make a little noise since there's only one metal to metal contact point being the stainless steel insert and the barbell sleeve. On another note though when putting a collar on the sleeves and the cast iron plates sit tightly against each other noise can be minimized quite a lot.
Price wise cast iron is cheaper, though not really that much. I still don't know what to do unfortunately.
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05-10-2021, 08:12 AM #11
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05-10-2021, 09:06 AM #12
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05-10-2021, 03:15 PM #13
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05-10-2021, 03:36 PM #14
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05-10-2021, 04:37 PM #15
I honestly thought about buying the watson plates and the price is just too high to be worth it. Even because of corrosion resistance it doesn't really make sense.
Watson plates actually cost ~16€ per kg including shipping and tax so it's a lot. I can buy cast iron plates for 2,9€ per kg and replace them 5 times and I still wouldn't be at the total price of the stainless steel plates.
If I buy the cast iron in Poland I even come in at ~1.8€ per kg so I could replace that 8 times. So in summary not worth it even if the cast iron rusts away which it won't in my lifetime, will it?
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05-10-2021, 06:17 PM #16
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05-10-2021, 06:40 PM #17
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05-10-2021, 07:47 PM #18
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05-11-2021, 06:01 AM #19
So it makes more sense to get the cast iron plates then because they are cheaper and probably last longer than PU in outdoor conditions even though they rust but rust isn't going to decrease the weight that fast.
If PU degrades you can't really fix it so you're stuck with uncoated cast iron plates that don't weigh as much as with the PU coating. Cast iron can be painted.
Is that right?
How long is cast iron going to last approximately in outdoor conditions before loosing 10% of its weight?
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