Preventing rust reappearing after a repaint

[Rudi]

Hi,

I'm considering repainting my PX. I have two concerns regarding the job:

1 - I'm thinking about not removing the current paint coats (at least two, as far as I can see) but only polish and repair dents and scratches with a filler.

2- A bigger concern I have, is how to prevent rust reappearing after the paint job, in the connecting area of the floorboard and body. I can polish and remove the rust I see on the surface, but I assume some unreachable rust will be left in. I'm thinking of maybe pouring some rust convertor into the area, from within the body (via where the fuel tank is)

What do you think?

[henri]

hydrate 80 , dont get the crap hammerite stuff sold in halfords . an yes pour it inside n slosh around an paint any bare metal outside in it . you can always pour some paint in afterwards to seal the internal seam ,but with rust cure inside an paint outside the seam should be sealed . rust needs 3 things iron/oxygen an water , remove 1 by sealing an new rust cant form . H

[doulsy]

You wont prevent rust from coming back you can only slow it down, there is products that you put on that creates a kinda plastic coating over the rust to stop it pushing through the new paint

[Rudi]

Thanks guys,
the 80 stuff looks like a good product.

Regarding the paint I think I'll leave the old coats, and just repair any dents or scratches.