A mate has asked me to help him sort the underside of his car as it is starting to show signs of its age. I was wondering what would be the best way to go about this and the best products to use.

I was think of using an angle grinder with a twisted wire knot attachment to remove the underseal then priming using zinc primer then finishing with hammerite smooth. I dont have access to any spraying equipment so has be all done with rattle cans/brushes.

Any advice on method and/or products to use?

Thanks
Dom

 

Mastic 121 and then paint over the top of that

 

can you just buy this in a tin and paint it on with a brush? if so, do you know where i can buy it? also do you need to paint over the top of it, as it is only for protection on a daily car.

 

hammerite smooth for sure mate, and best of all you can keep on touching it up if you get a stone chip for example

 

Don't use fucking Hammerite!

121 Epoxy Mastic. Best stuff you can buy. If it's good enough for ships and oil rigs, it's certainly good enough for any car!

 

why not hammerite?

 

Because it's a pikey way of painting the underside of a car.

It's good enough for my brake calipers and my garden furniture, but certainly not my chassis!

If you're going to do a job, do it right and use the correct gear. Which is definitely Epoxy Mastic!

 

Can go brittle and flake off I've found in the past. Could have been down to the prep of course, but it still put me off ever using it on the underside of a car again, and there are better alternatives now, like the ones already mentioned.

 

ow right thanks for that, ive never had a problem thats all

looks like im out voted anyway, 121 FTW

 

cheers for the input guys, still for some reason cant find a place that i can buy 121 online. have also been put in the direction of POR 15, if anyone knows about this?

 

I assume this is the stuff?

http://www.rust.co.uk/epoxy-mastic.cfm

 

Viper yes that is it

I used that then used some outdoor paint that was guarnteed for at least 10yrs over the top of it Looks spot on 2yrs later

 

sorry to bring up a old post but what colour mastic is best to paint over.. i have a teal colour car,,

 

Have you got a recent pic? Doing mine at the moment and just buying the paint etc.
Cheers

 

i took mine down to bare metal to check for rust, then acid etched primered it, sealed the joints etc, high build primer, then 2 types of stonechip paint and laquer took me a hell of a long time and the car was on its side aswell

 

BUMPAROO

I know this is an old thread, But i've just been reading a few threads on restoring the underside of a cars.

It seems on most threads i've read most replies recommend different things, some say hammerite, others 2pack paint, others underseal, others a full repaint from bare metal to etch primers etc

I'm looking just to take the surface rust off and protect the underneath of the car.
Can anyone clarify the best way

 

Epoxy mastic. See my resto below.