10 replies to this topic

[bentedder]

i have put a new flitch panel and scuttle pannel on my mini today and there is now some bare metal showing what should i cover it with etch primer or i have a few cans of red oxide?? whats the difference?? also when people are plug welding what size drill bit do you use to make the whole? i used a 7mm is that too big?

Edited by bentedder, 01 March 2008 - 09:57 PM.

[jack_marshall]

Etch bare metal.

I use about 8mm drill for plug welding, as most folk do I think.

7mm will be fine, just no smaller.

[macfoot]

you can get a can of u-pol acid 8 /etch primer from halfords for about a £10 ,its what the big boys all use in the work shops

Edited by macfoot, 02 March 2008 - 06:48 AM.

[MK111]

Hi bentedder,

As this is metal that you are painting, you do not really need use an etch primer. Etch primers are mainly reserved for painting alluminium. Red oxide is fine as a primer, provided the finish colour is of a red tint. However, all other colours I would be tempted to finish with a grey primer/filler before the top coat of paint. I have never used an etch primer on steel and I have never had a problem.

MIG button welding, use quarter of an inch or nearest millimeter size.

Hope this is of help,

John

[dezshearer]

I was removing rust and getting back to bare metal on my sills, inner wings bulkhead etc last nite, this morning i went out to the garage to find some surface rust!

Should i use red oxide if my final colour is going to be black? or should i go and buy some etch primer?

Will it be okay to leave the metal covered in primer while i tackle the rest of the bodywork, ie, welding and more grinding/sanding.

If not, what should i use to protect bare metal while doing bodywork, i dread the thought of rust appearing the next day after i weld in new metal.

by the way, the car is stored in a garage, but theres clearly some moisture somewhere cus' of all the rain =(



EDIT: Spelling!

Edited by dezshearer, 11 March 2008 - 10:37 AM.

[dezshearer]

bump

[Grimmy@JHE]

i have just sprayed anything over mine untill i know what to do.... just some black spray paint... you can allways easily sand it off in two tickswhen you know what the score is. better than rust.
hope this helps mate...

[dezshearer]

Cheers mate!

[Amy]

Just thought I should add here lads, that primer is not waterproof, infact it will absorb moisture and the metal will still rust underneath, so if it's sitting for long periods of time, you will need to cut back to bare metal again before painting it properly.....

[dezshearer]

black direct to rust hammerite then?

[midridge2]

just out of interest, i always just used celly primer over bare metal before painting but a few years ago i sprayed as normal and the primer just rubbed off with my hand when dry, i changed to another primer and it was ok.
next time i was painting,i used etch and sprayed over it with the primer that had rubbed off and it was ok, so now i always use etch first to be sure.
i have used brushing red oxide but found it a pig to flat down and when painted over the paint had not stuck and chipped of very easy, so now i dont use it if it is to be sprayed over.