This is Shocking!! Any Idea's??

[Guest]

Just so I can keep this a short story, I'll hit the high lights, otherwise it would be a long post.

Got this 60 Studebaker Truck bumper from a friend to PC for him in Black. Okay no prob. Sand blasted it blew off, wiped down, the whole routine. Cured, took it out and it was covered with pinholes. Outgas I'm thinking. Soooo, you know the drill, strip and so on. I have had more issues with this bumper from hell then one person deserves. I have had this bumper for around 9 or 10 months. Yep, that's what I said. After three or four attempts and because my friend was in no hurry, it got set aside for a few months and because I got busy. Anyway, I had outgas, back ionization, weird scratchy blemishes, op, and can't remember everything.

I've stripped, sanded, media blasted, preheated for over an hour. So this past week I figured I'd better get it out of my shop. It got sanded again, cleaned with Simple Green, blew off, wiped with metal prep. Coated and the one end of the bumper had B. I. again after hanging for over three months. Okay, I've had it. time to strip it and cook the shitt out of it this time and start over. Blew off powder. Laid it on the floor (so I could jump up and down on it ) and cleaned it off. When I run my hand down the length I got the hell knocked out of me . Okay maybe I should get it off the floor. Laid it on an old arm chair that was padded and wiped my hand down it again and really got the shitt knocked out of me.

So what the hell is going on here?? Anybody have this happen or know what is going on? I sure don't know. I ain't going to let this bumper win.........

[Guest]

Re: This is Shocking!! Any Idea's??

Is it chromed? Are you sure you have reached bare metal?

[Guest]

Re: This is Shocking!! Any Idea's??

Not chromed, bare steel. Yes to bare metal. Good earth ground with meter check.

[Guest]

Re: This is Shocking!! Any Idea's??

Not chromed, bare steel. Yes to bare metal. Good earth ground with meter check.

Got me man... hopefully someone else can come up with an explanation.

[Streetwerkz]

Re: This is Shocking!! Any Idea's??

some of those old bumper have some sort of metalized coating on them that looks like bare metal when you blast it, and is not very conductive.
the coating is tougher that hell to get off, I hate doing it, or saying it but...
I have had to coat it, block it to get rid of the pinholes, then hot flock a second coat.

I hate hot flocking, but sometimes you have to

[Guest]

Re: This is Shocking!! Any Idea's??

Like you Street, I don't much care to hot flock, although I have done it and probably will down the road. The bumper just barely fits in the oven and is a chore to get in and out. My main concern is the electric charge that seems to be very well attached to this bumper. I mean, it really got me. With that charge being in/on it makes for a back ionization nightmare. Not to mention how the sparks fly. Will try some dumb idea's today to see if I can get this figured out.

[Guest]

Re: This is Shocking!! Any Idea's??

I wonder if theres some copper or some kind of old iron on or in the bumper thats holding a charge. You said you get shocked at the one end only everytime. So what I would do is take a wire attach it good to the bumper and ground it. Then leave it for a couple of days to discharge. Leave the bumper ground the whole time when it comes time to shoot it up to that last second then set the kv's low and shoot, doing the problem end first.

[Streetwerkz]

Re: This is Shocking!! Any Idea's??

could try grounding it in several areas
maybe on each end, and in the middle, couldn't hurt to try.... wait it may

[X-Link]

Re: This is Shocking!! Any Idea's??

Wonder if using a gun with very little charge (HF comes to mind) would actually work well here. I know the more powerful gun I got even if it is adjustable had more back ion than with that cheap ass gun.

Ya know one other thing call me crazy to try would be to connect a capacitor between the part and the other end to ground. Maybe it would transfer the back ionization better.

[FirstYearDeek]

Re: This is Shocking!! Any Idea's??

Double-check the ground on the outlet your gun's power supply is plugged in to.

I would also try grounding several places... you can use plated neodymium magnets and steel wire to put as many grounds as you want in as many places as you want.

-Deek

[Guest]

Re: This is Shocking!! Any Idea's??

Ya know one other thing call me crazy to try would be to connect a capacitor between the part and the other end to ground. Maybe it would transfer the back ionization better.

You want to use a doide along with the capacitor to allow only one way flow then.

[Guest]

Re: This is Shocking!! Any Idea's??

haha hjeads i was thinking that too eh...or you are going to potentially build that charge up real nice and spike the whole thing down your arm in 1 shot.

OK I got to say this is just an odd thread. I saw this yesterday and wasn't even sure you really meant it shocked you or what. That is seriously weird. Throw it in a lake Has it been sitting somewhere with wind blowing over it? and in a position where it wouldn't have had metal touching anything grounded? This whole thing is just odd as shit. Hook up a tester to it and check continuity from end to end of the thing. Then even more fun...put the tester to ground and check if there is current? wtf I have no idea. I can see you putting a magnetic charge on a piece that can mess stuff up, but an actual current into the piece...thats crazy. Is it magnetic? ie does it attract? I just can't understand how it could hold a charge if you ground it and leave it for a bit. Even if it has piss poor conductivity end to end, its got to have some.

[Guest]

Re: This is Shocking!! Any Idea's??

Ya know one other thing call me crazy to try would be to connect a capacitor between the part and the other end to ground. Maybe it would transfer the back ionization better.

You want to use a doide along with the capacitor to allow only one way flow then.

Being a long time Ham, I had thought about that. What I have done is put a big magnet to it and hooked that to ground and will leave it till tomorrow. I also have the wire for the fan run along with the ground and thought an RF from that wire may be the cause. It does show current, both AC & DC when I touch one probe to the fan wire and the other probe to the ground. But it is not steady, but all over the scale under 1 volt. So I will run my hand on it again tomorrow and see if I get the shock again . If I do, it will get Hot Flocked. Don't know where else to go with it. Wish I could find out what is causing it though.

[C3PC]

Re: This is Shocking!! Any Idea's??

If you heat it up real good, won't that kill the charge? I know if I have to blow powder off a part and start over it will always go in the oven for a few minutes before trying to coat again. I might be F.O.S but it seems to help.

[Guest]

Re: This is Shocking!! Any Idea's??

I heated the bumper once before, but am open to anything. I may try that again and if that don't fly, I'm thinking hot flock. Got some Chrome powder that don't like the second coat on it either. This past week has sucked as far as PC.