My rallye is undergoing a very slow restoration at present. Over the weekend I bare metaled two of the arches and painted on two coats of Bilt Hamber zinc primer. All looked nice and primed until today I noticed that there is water sitting on top of the primer in places, its like the rust is sweating through the primer. Anyone else had similar experiences?

No, I find Bilt Hamber Electrox primer excellent. I've done my rear arches and the boot floor. Water is most likely condensation, which can occur inside garages at this time of year.

A fence at work was painted with zinc and the rust does not travel beyond the zinc as it stops steel rusting by being a sacrificial anode, one of the best rust stopping methods and used by Pug when the 306 was new. After the zinc is all corroded away the steel will start rusting. You can see this effect on the 306 wheel arch edges where the zinc is slowly corroding away inwards from the edge of the paint, but the steel does not rust for a long time.

While strictly you do not have to remove all the rust for Electrox to work, it will last a lot longer and make a much better job if you do.

To elaborate slightly on Matt said, use a wire brush/fibre wheel in a drill and get as much rust as possible off, use de-ox gel to dissolve remaining rust and get the metal clean, then use hydrate 80 to convert any rust specks remaining in pits, seams, corners etc and put the Electrox over the top of this.

________________________________________

Cherry Rallye SOLD

Its probably what you said then Phil. Did it last weekend when it was a bit nippy out, I do live on Dartmoor! Its worried me a little though as the damp has come through on the areas I know were rusty. In time I will probably sand down and reapply the Bilt Hamber.

My surface prep was a silicon carbide (I think) disc on my drill. Took everything down to bare metal. I didn't use any chemicals though so there was possbile some rust particles hiding in the pitted areas.

What happened Russ...?

For a start that primer will take 10% surface rust and still work and for second its best to key the clean steel with 300 grade wet and dry, so it sticks well without it scratching off via finger nail in my experience. Its also ok to use it on top of other primers too if its keyed well enough.

Hydrate 80 is pretty rubbish tbh, you have to be precise when doing it all, clean n oxidise surface prep else rust will come through again. I get rid of rust totally is the best way.

________________________________________

Pug fee`ver,

Pick a Bogey, buy a Pug.

Black 306 GTI 6 Standard, was 60k mileage, bargain!!

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url & =

May as well use De-ox rather than hydrate 80 in that case...

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.