9 replies to this topic

[haggi961]

I've recently had my wishbones zinc plated then powered coated but the powered coat hasn't took very well due to not being in the oven long enough I reckon. The powered coat is just flaking off in chunks and needs doing again. Will the shot blasting or sandblasting method they use remove the zinc playing I've had done or will it be fine. I plan to get them powered costed again but don't want to lose the zinc plating as I could just refurb myself with Por15 paint as this goes straight over powedercoat Any help would be great cheers.

[fezzasus]

you'll remove the zinc plating. I would also be reluctant to paint over loose powdercoating because the powdercoating could still flake off, removing the paint with it.

Edited by fezzasus, 08 September 2015 - 02:35 PM.

[robin]

sand blast the lot off and get painted 2k instead mine still Look like new and for what zink coating there is left after blasting Wouldnt make much difference unless you get then re dipped Then paint.

[FLD]

Why not chemically strip the powdercoat?  1:1 DCM / MeOH should do it and shouldn't affect the zinc plating.

[haggi961]

you'll remove the zinc plating. I would also be reluctant to paint over loose powdercoating because the powdercoating could still flake off, removing the paint with it.

I was going to remove as much as I could as it's just flaking off and hopefully build it back up with the por paint.

[haggi961]

sand blast the lot off and get painted 2k instead mine still Look like new and for what zink coating there is left after blasting Wouldnt make much difference unless you get then re dipped Then paint.

Il have a look into the 2k paint. Is it better then the por 15 paint?

[haggi961]

Why not chemically strip the powdercoat?  1:1 DCM / MeOH should do it and shouldn't affect the zinc plating.

I take it that's something I could do myself at home or is it a professional job?

[FLD]

If you can get the stuff yes. Just do it outside!

[Madmitch]

We never used powder coating because it can hide corrosion of the metal component underneath.  Eventually the powder coating will crack and split off but by then the damage is done and the object you were trying to protect is beyond recovery.  Hot zinc dip provides both a chemical and physical barrier and takes a lot of beating.

[haggi961]

im just seeing what's you guys think will be the best process now to get a good key into the zinc plating without damaging it. I've been reading that the powdercoaters should of used a primer before hand for the paint to key so maybe this wasn't done. I think I might just paint them myself now so need to find something that's going to key into the zinc plating ready for the por paint. Would a etch primer be good or could this damage the zinc plating?