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Classicarbon
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I got chrome bumper  where on 90% surface chrome is fine,just underneath get bit rusty.  Rust is to big to polish,should I use a filler ?or leave that for.later on and polish the gelcoat? Thanks
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Warren (Staff)
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It's not something that would really suit epoxy. If its not visible, sand it all back, rust treat then coat with a chrome style rattle can paint so it doesn't look too bad if some one were to look. A quick fix would be to apply Kurust or similar rust converters, then rattle can over surface as above.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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Classicarbon
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+xIt's not something that would really suit epoxy. If its not visible, sand it all back, rust treat then coat with a chrome style rattle can paint so it doesn't look too bad if some one were to look. A quick fix would be to apply Kurust or similar rust converters, then rattle can over surface as above. So paint from rattle can Will be enough to się gelcoat over?
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MarkMK
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I'm not certain that Warren picked-up on the fact that you're looking to take a mould from the bumper and thought, perhaps, that you were just looking to fix the rusty areas? Rattle can paints are unlikely to give you a good surface from which to mould from and it would likely be attacked by the gel coat and come away during de-mould You might just end up with some rough spots if you went ahead and moulded direct from it as is, but you might also get spots of gel coat sticking to the rusted areas that leave you with holes to repair afterwards in the mould If you're not minded to paint the whole thing with a reliable paint system in order to get a good surface all over, you could opt to cover the bad bits with flash tape if that element of the part would be mostly hidden when mounted (underside?). This would be the 'quick and dirty' option but probably depends upon how critical the affected area is to the part cosmetically. If you opt to use ordinary filler this would likely stick and pull away upon de-mould and the process of flatting it would also scratch-up the surrounding areas, so likely not a great option on its own.
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Classicarbon
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+xI'm not certain that Warren picked-up on the fact that you're looking to take a mould from the bumper and thought, perhaps, that you were just looking to fix the rusty areas? Rattle can paints are unlikely to give you a good surface from which to mould from and it would likely be attacked by the gel coat and come away during de-mould You might just end up with some rough spots if you went ahead and moulded direct from it as is, but you might also get spots of gel coat sticking to the rusted areas that leave you with holes to repair afterwards in the mould If you're not minded to paint the whole thing with a reliable paint system in order to get a good surface all over, you could opt to cover the bad bits with flash tape if that element of the part would be mostly hidden when mounted (underside?). This would be the 'quick and dirty' option but probably depends upon how critical the affected area is to the part cosmetically. If you opt to use ordinary filler this would likely stick and pull away upon de-mould and the process of flatting it would also scratch-up the surrounding areas, so likely not a great option on its own. You right,think the best way might be to clean it as.much as possible,fill it up and smooth it out as much as possible and cover it with flash tape.
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Warren (Staff)
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Mark is right, hadn't seen a bit about moulding it. Just thought you were trying to repair with gel.
What he said is right. You might be able to sand away the rust spots and polish those bits up and fill slightly with a few layers of mould release wax. That way the mould will just have some slight raised areas where the rust is that can be relatively quickly sanded level and polished back up to a gloss.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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Classicarbon
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+xMark is right, hadn't seen a bit about moulding it. Just thought you were trying to repair with gel. What he said is right. You might be able to sand away the rust spots and polish those bits up and fill slightly with a few layers of mould release wax. That way the mould will just have some slight raised areas where the rust is that can be relatively quickly sanded level and polished back up to a gloss. That's me on the right way again. Thanks
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Classicarbon
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+xMark is right, hadn't seen a bit about moulding it. Just thought you were trying to repair with gel. What he said is right. You might be able to sand away the rust spots and polish those bits up and fill slightly with a few layers of mould release wax. That way the mould will just have some slight raised areas where the rust is that can be relatively quickly sanded level and polished back up to a gloss. I clean the rust, the holes are so small that body filler not fill it up them,so I used flash tape.will need more sanding after. 
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Lester Populaire
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+x+xMark is right, hadn't seen a bit about moulding it. Just thought you were trying to repair with gel. What he said is right. You might be able to sand away the rust spots and polish those bits up and fill slightly with a few layers of mould release wax. That way the mould will just have some slight raised areas where the rust is that can be relatively quickly sanded level and polished back up to a gloss. I clean the rust, the holes are so small that body filler not fill it up them,so I used flash tape.will need more sanding after. I would just use a release wax that already fills in most of the porosity and then whatever is left in the mold will be raised so is super easy to sand back. With the flash tape there is a lot more work that needs to be done to the surface. In the worst case you will even open up some porosity in the gel coat and then you are back to square one...
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Classicarbon
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Group: Forum Members
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+x+x+xMark is right, hadn't seen a bit about moulding it. Just thought you were trying to repair with gel. What he said is right. You might be able to sand away the rust spots and polish those bits up and fill slightly with a few layers of mould release wax. That way the mould will just have some slight raised areas where the rust is that can be relatively quickly sanded level and polished back up to a gloss. I clean the rust, the holes are so small that body filler not fill it up them,so I used flash tape.will need more sanding after. I would just use a release wax that already fills in most of the porosity and then whatever is left in the mold will be raised so is super easy to sand back. With the flash tape there is a lot more work that needs to be done to the surface. In the worst case you will even open up some porosity in the gel coat and then you are back to square one... So.might use flash tape on the holes only.
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