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Hammerite / underseal

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waveydavey:
Take it off and Galvanize it!

OK, a bit of a big job but you can get brush on paint loaded with Zinc, not as good as galvanizing but damn good steel protection.

I do agree with Hammerite being brittle, damn good stuff but in the right places.

Defender:
I agree, I don't like hammerite as it is too brittle & chips too easily.
I use Frost Chassis Paint. Top of this webpage
A good coat of Waxoil over the top each year also helps.

ben_haynes:
Waxoil or other Underseal is best and it might be an idea if you spray it on as it can be a pain to get in to all them nooks and crannys that hold the muck and water with a brush

Dr Strangeglove:
As Wavetdayey say's, a good zinc rich primer.  I design paint finishing systems and when I got my RRC I asked one of our guy's who has managed a finishing line (he is also a chemist!).  He said in first place galvanising, in second place pre-treatment and then powder coating, and in third place painting with a good zinc-rich primer.  He suggested a two-pack zinc-rich primer as it will be much stronger due to its chemical curing.  He also noted that with the two pack they tend to have a higher zinc content!

Always make sure you read the instructions mind as some may require baking to dry and may also contain nasties an as such you may need an air fed mask!

Dr Strangeglove:
Oops - forgot to say - always waxoil inside and out after you have coated it.

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