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Thanks Peter. I was getting worried. I also spoke with Protec today and he stated 408 was fine to use. What product do you use as a top coat? Cheers. |
Alex |
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Rank: Member
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Joined: 25/09/2012(UTC)
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I know when i did my pb apprenticeship 25 years ago i was taught at tech and at the bodyworks to bog on to bare metal but no doubt there may be new products out now which mean doing things differently? Im probably stuck in the dark ages! |
'not until all else fails read instructions!' |
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Rank: Member
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I completed my apprenticeship in the mid 70's, i was also taught to use Auto Repair Putty directly over bare metal, both by the Body Shop and the Trade School, have never had any issues with the filler playing up this way. Old Skool Maybe!
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Rank: Veteran
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Joined: 22/05/2005(UTC)
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All the restorations we do that have issues with any old repairs. Maybe 20- 30 years old.
The filler that is on bare metal has rust on the metal under the filler.
We may have been taught to put filler straight on metal when doing CRASH repairs, but restoration is different. Body filler, polyester putty, auto repair putty, fibrofil, bridging filler. Whatever you call it, it is porous, and moisture will eventually cause oxidisation of the metal surface that the putty/ filler is touching.
If it is made of iron, I assure you it will rust. |
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Rank: Member
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Here is my 2 cents and what we were taught at tech and at the shop.
Body filler was put on bare metal,not smooth or shiny metal for that matter.
Body filler should never go over paint.
Now for the rust under the bog bit.This happens when the panelbeater felt the repairs with his sweaty bare hands and said,yep...time for filler.
He applied the filler over the metal but what he couldnt see was the sweat on the metal he left behind...this causes rust under filler.
Many more things cause this such as leaving the metal exposed for hours or overnight to be finished in the morning,well...the rust process has started.
I was taught,once repaired,DONT TOUCH IT...apply filler as soon as possible.
If you can get behind the repair,file finish it.
No filler,no worries.
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Rank: Member
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Hi also want to know? The paint on replacement panels is it ok to prime over or should it be removed? Thanks
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Rank: Veteran
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Joined: 22/05/2005(UTC)
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quote:
Originally posted by ROBSHK
Hi also want to know? The paint on replacement panels is it ok to prime over or should it be removed? Thanks
If the coating on the replacement panel is electro-coat or Two pack, then it may be ok. On new cars, replacement panels from the dealer have factory e-coat on them. If it is a rust replacement section, then I suggest you remove all coatings off back to bare metal. |
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