69 bed rust repair options

[prdjr1]

I have a 69 f100 short bed tham i'm getting ready for paint-I came accross this rust when media blasting.it looks might it might have been repaired with lead or something at one time.there is a small 2"x2" metal patch piece attached on the underside of this area that is loose and i slightly pryed it away.my question is if you can tell from the pictures if i should cut this area out and patch it or can i get away with some POR15 and fill it.It's really close to the seam and thats where i'm concerned with patching it.

[MAK]

After going to the trouble or expense to blast the whole bed, I would go ahead and cut it out and weld in a patch. Anything else would eventually trap moisture and rust again IMHO.

[cep62]

[ButtaBean]

After going to the trouble or expense to blast the whole bed, I would go ahead and cut it out and weld in a patch. Anything else would eventually trap moisture and rust again IMHO.

True story. I agree.

[prdjr1]

removed the bed yesterday-picking up a welder friday.

[LCarter69]

I have the same issue, except ive got a small spot behind the seam as well. I'm thinking of putting in a single patch since im smoothing the seam anyway.

[prdjr1]

by smoothing the seam do you mean welding it ?