bristol_fez

iTrader: (1)

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

JamesH

iTrader: (21)

Mastic 121 and then paint over the top of that

bristol_fez

iTrader: (1)

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.

jammerrs

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

Mike C

iTrader: (1)

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!

jammerrs

why not hammerite?

Mike C

iTrader: (1)

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!

Viper_

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.

jammerrs

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

looks like im out voted anyway, 121 FTW

bristol_fez

iTrader: (1)

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?

Viper_

I assume this is the stuff?

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

JamesH

iTrader: (21)

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

saddler

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

cameron2

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

xr4x4rs

iTrader: (5)

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

Pob

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

cameron2

Epoxy mastic. See my resto below.