March 19, 200917 yr Author Looking good Wayne. Thanks Steve. It was worth the time spent last w/e going over the blasted finish to flatten it back a bit. The finish on the powder coat is real slick apart from the little areas meantioned above. Thats the trouble with dealing with old fabrications with all those little voids under welded on brackets etc. They trap oil which can bubble out in the ovens. Cota 330 frame will be blasted next week! Wayne....
March 20, 200917 yr So with all this time, care and money lavished on the bikes will they be ridden in anger or will you be too scared to scratch them?
March 20, 200917 yr Author Of course I'll be riding them Steve. Though I think as I said before I may resort to a Polyprop tank for when riding in anger. A scratch on the frame is nothing compared to the paint falling off and rust forming because I didn't even look at my bikes! Making Amends did seem apt. Time and care certainly, bugger all money has been spent though! Wayne... Edited March 20, 200917 yr by wayne_weedon
March 20, 200917 yr Just a quiet word of warning ..... Many moons ago i had a frame zinc & passivated before painting and the residue in the tubes leached out and marked the paint. Sigh.... nothing is ever easy.
March 20, 200917 yr Author Yes I know it can happen. We always drill a small drain hole on commercial fabrications with closed voids to deal with the problem. A good couple of preheat cycles in the ovens can also boil it off. Some progress today. Fitted a little mod which has been in development a little while Wayne.... Edited March 20, 200917 yr by wayne_weedon
March 21, 200917 yr Normal bright zinc is a c.10 micron coating. Nothing at all to be concerned about. I'm not talking about hot dipped galvanising.Wayne.... Do you not have to consider hydrogen embrittlement with the plating process?
March 21, 200917 yr I thought the embrittlement only came about with Chrome plating, and is why some frame makers Nickel plated their frames.
March 21, 200917 yr Author It can occur on all electroplating types and the common solution is to bake the parts which I think releases the trapped hydrogen. It is usually more a problem on hardened steels and high carbon steels. Now I'm not even sure what an 80's Spanish frame was made from, but I can certainly ask my platers who are not the average backstreet cowboys (Even Talon use them ) what they recommend if anything. Wayne...
March 22, 200917 yr Author looking good, love those swingarm bearings I was pretty damned pleased myself how it turned out in the end. Not sure what to do next now! Probably clean up the bash plate and refit and then start working on the front end. I'll probably wet spray the blue stuff though. Anyone know a RAL colour code for the Bultaco Blue? I always used Ford Electric Blue before, but not sure it's absolutely right. Wayne.... Edited March 22, 200917 yr by wayne_weedon
March 23, 200917 yr It can occur on all electroplating types and the common solution is to bake the parts which I think releases the trapped hydrogen.It is usually more a problem on hardened steels and high carbon steels. Now I'm not even sure what an 80's Spanish frame was made from, but I can certainly ask my platers who are not the average backstreet cowboys (Even Talon use them ) what they recommend if anything. Wayne... Later Bultaco frames were chromoly, although I don't know the exact alloy.
March 23, 200917 yr I was pretty damned pleased myself how it turned out in the end. Not sure what to do next now! Probably clean up the bash plate and refit and then start working on the front end. I'll probably wet spray the blue stuff though. Anyone know a RAL colour code for the Bultaco Blue? I always used Ford Electric Blue before, but not sure it's absolutely right. Wayne.... Not sure, but that Toyota blue I have seen on the FJ cruisers looks real good. Would have to compare it! Personally, I just can not do anything permanant with the powder coat, as it seems spot repairs and match are just too difficult. (yes that stuff chips too)
March 23, 200917 yr I was pretty damned pleased myself how it turned out in the end. Not sure what to do next now! Probably clean up the bash plate and refit and then start working on the front end. I'll probably wet spray the blue stuff though. Anyone know a RAL colour code for the Bultaco Blue? I always used Ford Electric Blue before, but not sure it's absolutely right. Wayne.... RAL 5015 for the 340 199B apparently Big John
March 23, 200917 yr Author Funny you should say that John. I just cleaned the tank with a bit of T-Cut (No lacquer left on the tank) and thats what I came up with when offering the RAL colour swatches to it. A slightly "muddier" blue compared to Electric Blue. Wayne...
March 24, 200917 yr Funny you should say that John. I just cleaned the tank with a bit of T-Cut (No lacquer left on the tank) and thats what I came up with when offering the RAL colour swatches to it.A slightly "muddier" blue compared to Electric Blue. Wayne... That is why, I suggested! Ck out the Toyota color, I could be totally off here, but would like to know, as you just have to see it side by side.
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