+x

 

Warren (Staff) - 8/12/2019 4:20:20 PM

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.

+x

 

Classicarbon - 8/14/2019 1:02:33 PM

+x

 

Warren (Staff) - 8/12/2019 4:20:20 PM

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.

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.

+x

 

Lester Populaire - 8/14/2019 2:14:34 PM

+x

 

Classicarbon - 8/14/2019 1:02:33 PM

+x

 

Warren (Staff) - 8/12/2019 4:20:20 PM

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.

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...