can chroma 7704s 2k be put over bare metal

[old96r]

Hi, Im looking for a little help before I paint. I have done some repairs like filling small dings with body filler and welded in a new cab corner. While doing these I obviously got into the bare metal and while sanding and feathering in the body filler the bare metal area grew a little around the edges. Anyway I did not epoxy primer these areas, I primed them with chroma 2k 7704s surfacer. This has all been blocked out and wet sanded and is now ready for paint. I have been told that the primer i used will peel from the bare metal because I did not use epoxy or etch first.
Do i need to sand these areas back to metal and use epoxy or etch? We are not talking about large areas maybe four or five inch areas of bare metal that had been roughed with 80grt.
thanks for any sound advice

[Len]

Hi, Im looking for a little help before I paint. I have done some repairs like filling small dings with body filler and welded in a new cab corner. While doing these I obviously got into the bare metal and while sanding and feathering in the body filler the bare metal area grew a little around the edges. Anyway I did not epoxy primer these areas, I primed them with chroma 2k 7704s surfacer. This has all been blocked out and wet sanded and is now ready for paint. I have been told that the primer i used will peel from the bare metal because I did not use epoxy or etch first.
Do i need to sand these areas back to metal and use epoxy or etch? We are not talking about large areas maybe four or five inch areas of bare metal that had been roughed with 80grt.
thanks for any sound advice

DuPont says that you can use 7704s on small sand through spots so I think you're probably ok IF the primer was applied wet and not dry. If you apply any primer using a dry spray it won't stick as well as a wet coat.

[old96r]

thanks, it was applied wet and I intend on using a sealer before paint. I have spent a large amount of money and time on this project and just wanted to make sure I didnt make a costly mistake at the end.

[Len]

thanks, it was applied wet and I intend on using a sealer before paint. I have spent a large amount of money and time on this project and just wanted to make sure I didnt make a costly mistake at the end.

Put some 2" tape on the primed areas and press it on real good then pull it off fast. If any primer comes off with the tape then you probably should remove it and start from the metal using a good epoxy primer.