Scraped underseal / paint on speed bump - advice please?

[windandwave]

I scraped a speed bump today. Getting home I discovered a small patch (inch / inch and a half) of underseal / paint gone on the sill - this portion is down to bare metal.

I presume I need to reseal this - how? Is this a DIY job or should I leave it to a garage? Does it need resprayed then sealed, or just sealed? And is it important to do it asap or can it wait a few weeks?

Any advice would be appreciated.

(Car is a 1997 Alfa Spider if it matters)

[RazMan]

If it has gone down to bare metal you will have to:

1> Clean with meths to remove any traces of underseal where you need to paint.
2> Brush on some suitable primer
3> Ditto top coat
4> Ditto underseal

As the damage is underneath it will presumeably not be seen from normal viewing angles so brushing the paint on is ok. You could even miss out the top coat stage if you want a quick job, but I like to make the 'invisible' the same finish as everything else.

[steve_d]

I would just spray on some Hammerite 'stone chip shield' from Halfords etc. It has an antirust formula and is quick.
Do something as soon as possible as the rust started before you even got home.

Steve

[windandwave]

Thanks for the advice. I'll go with the Hammerite as a temporary solution and later get round to doing it properly.

[leorest]

Check the paint types for compatability.
I can remember trying to paint celulose on top of sommtherite and it didn't stick!

I would Hammerite then underseal it!

Leo

[windandwave]

Hammerite bought - bottom of car pressure washed and drying at the moment. Will clean area with pad / wire brush before spraying. Any other tips?

[BigBob]

windandwave said:

Any other tips?

Take pics of the damage and try claiming for the cost of repair from the local council.

They've foisted these obstuctions on to us motorists and if it's ended up causing damge to your vehicle when you are going about your lawful business they obviously aren't suitable for the purpose.

[M3 Mitch]

If you want to be super-thorough, get some "metal prep" which is a phosphoric acid solution (with other stuff I'm sure) which will chemically etch the bare metal, removing any trace of rust, and it promotes primer adhesion.

You could use an anti-rust primer.

I like Big Bob's idea. Sue the b@stids!