Fixed Pants™ Posted August 8, 2007 Report Share Posted August 8, 2007 (edited) Right, over the last week or so I've been wondering if spray paint/paint in general really makes that much difference to the weight of your bike.Given that 1l of water= 1kg, and I've just used 1.2l of spray paint on my frame and forks, ontop of how ever much anodizing, i might have made my bike 1.2kg heavier?! Given that my bike already weighs a bit (certainly not the lightest bike around) i don't think I've got much margin for weight.I'd be willing to caustic soda the anodizing off to make it a nice raw frame and forks (it won't affect strength or anything will it?) and weigh it before and after that... Not sure when I'd be bothered to do it though.So, basically, does spray really weigh that much? I'm thinking not quite as much as water but it can't be far off, because it once was in a liquid state.btw, i searched, didn't find anything though. Edited August 8, 2007 by Fat Pants Quote Link to comment Share on other sites More sharing options...
BenLeacock™ Posted August 8, 2007 Report Share Posted August 8, 2007 the actualy paint tin will also add to the starting weight Quote Link to comment Share on other sites More sharing options...
Greetings Posted August 8, 2007 Report Share Posted August 8, 2007 Anodizing is the process of removing metal. It doesn't make things heavier, but lighter.When you apply the colour and sealant, you'll end up with about +40g on a fully anodized frame. Quote Link to comment Share on other sites More sharing options...
Fixed Pants™ Posted August 8, 2007 Author Report Share Posted August 8, 2007 (edited) Well, not really, because it tells you you're buying 600ml of paint, and pretty much (out of the liquids that have a similar viscosity to water) will weigh 1kg per 1l.Sorry for the lack of quality of the first post, i have good ideas and think i can write an essay on it, but when it comes to it, it turns out shit EDIT: Inur, you man of all knowledge (and JT), fair enough on the anodizing bit, i didn't quite realise it removed metal, but surely it's more than 40g for the spray? Edited August 8, 2007 by Fat Pants Quote Link to comment Share on other sites More sharing options...
Joe_Elding Posted August 8, 2007 Report Share Posted August 8, 2007 Not all the spray that left the can will of gone on the frame though, especially if you sprayed outside...complete guess but i doubt more than 85% of the paint went on the frame Quote Link to comment Share on other sites More sharing options...
Fixed Pants™ Posted August 8, 2007 Author Report Share Posted August 8, 2007 True stories, it was outside, so maybe yeah, but still, that means i've put about 1l of it onto the frame. Quote Link to comment Share on other sites More sharing options...
Tomm Posted August 8, 2007 Report Share Posted August 8, 2007 Most of the spray is propellant I think - or something else. Either way it evapourates or something and doesn't find its way onto the bike. A full (good quality - thick!) paint job (primer, colour, laquer) weighs about 200g I think. Quote Link to comment Share on other sites More sharing options...
Fixed Pants™ Posted August 8, 2007 Author Report Share Posted August 8, 2007 Propelant is only butane or similar, so only a gas (would be a liquid inside the can though, due to the high pressure it's put under), but i'm not sure of it being liquid, all i know is that it will keep a constant pressure of whatever the propellant is ('butane 40' would have a constant pressure of 40psi until all of it is gone, similar to butane cans that you get for portable cooker thingies)But there really should be more weight than that, i can't understand how so much of it is 'wasted'/ doesn't go onto the bike. Quote Link to comment Share on other sites More sharing options...
King C Posted August 8, 2007 Report Share Posted August 8, 2007 most of the small particles will disperse into the air. I reccon only around half the paint you spray actually lands on the frame. Quote Link to comment Share on other sites More sharing options...
Tomm Posted August 8, 2007 Report Share Posted August 8, 2007 Paint is wet. Then it dries. As it dries, the liquid portion (which makes up most of the weight) evapourates. Quote Link to comment Share on other sites More sharing options...
Greetings Posted August 8, 2007 Report Share Posted August 8, 2007 Pants, I was only referring to the part where you wrote that you didn't remove the anodizing before painting. If you removed the anodizing, you wouldn't have saved much weight. I have no idea how much spray paint weighs, but take into account that what you spray your bike with then has to dry. I'd be really surprised if your bike is even 300g heavier than before. Quote Link to comment Share on other sites More sharing options...
ManxTrialSpaz Posted August 8, 2007 Report Share Posted August 8, 2007 If you think about it, some of the can would have missed ytour frame (outside), some of the can was propellant and actual paint is made up of pigment, binder and a solvent and the solvent evaporates as well. So very little of the cans composition will stay on your frame. And the can probably wasn't full in the first place - the measurement was probably rounded up. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted August 8, 2007 Report Share Posted August 8, 2007 A full (good quality - thick!) paint job (primer, colour, laquer) weighs about 200g I think.Anodised frames *** Quote Link to comment Share on other sites More sharing options...
Dani. Posted August 8, 2007 Report Share Posted August 8, 2007 (edited) Yeah, it's all true. You won't have made your bike 1.2Kg heavier because of factors like evaporation, particle dispersion, propellant weight (as said before) and paint density (whose "weight" is relative to it's volumic mass, not viscosity btw). I'd estimate about 500g max more weight added. Edited August 8, 2007 by Dani. Quote Link to comment Share on other sites More sharing options...
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