stone chips

[Jack155Q4]

After reading Carlos thread (which I meant for this to be a reply in), could you tell me what a D/A is?

I have the same stone chip problem with my first project re-spray.

Am I best to sand these right down flat or fill them in with something?
They are a bit scattered so I don't want to end up with high and low points.

I have keyed the original paint with 600 grit W&D.

Many thanks.

 

[Chickenjohn]

Use a DA with 240 grip paper to "feather out" the stone chips. Otherwise when you paint the car each chip will still be visible as a crater underneath the new paint. Etch prime any bare metal you get to at the bottom of the stone chip. ALso, make sure you remove any rust in these stone chips or it will be back bubbling under your nice new paint.

 

[Jack155Q4]

Thanks. Should I use white primer over the etch primer if I meet metal?

 

[slim_boy_fat]

.... could you tell me what a D/A is?

Many thanks.

DA = dual action or orbital, as opposed to rotary which is like an angle grinder.
The DA is more forgiving, and you're less likely to inflict unwanted damage to paintwork.

 

[Chickenjohn]

The dual action sander will sand the surrounding paint down without obvious scratches as it is a randomised sanding system so the transition between bare metal where the stone chip was and the undamaged paint is smoothed out.

 

[Jack155Q4]

Many thanks all.

As for Etch primer...which of these might you recommend?

http://cgi.ebay.co.uk/Aerosol-HB-Et...pplies_Paint&hash=item5194ed2424#ht_698wt_907

http://cgi.ebay.co.uk/Pro-XL-Aeroso...pplies_Paint&hash=item3362abcf02#ht_500wt_922


Obviously it will be hard to confine the etch primer just to locations where bare metal is shown but this is just the way it goes. Should I prime with filler primer on top of the etch?

 

[Jack155Q4]

Or, what about knifing putty on the chips? Is this stuff recommended?

 

[Chickenjohn]

Knifing putty is only used for filling pinholes and tiny scratches in filler.

The way to deal with the stone chips is DA them till they have gone and you have a small bare metal area and feathered out primer. You really need to feather out the stone chips. sand this

till you get this

If you do not have a DA, use 400 grit paper with a block and sand evenly in all directions till each chip is fully feathered out. Then etch prime the bare metal aread with a dusting, filler prime a few times , flat and paint.

 

[Jack155Q4]

Thanks very much.

Enjoying this new hobby..lots to learn.

 

[Jack155Q4]

Which etch primer is best suited to me for this?

http://cgi.ebay.co.uk/Aerosol-HB-Et...pplies_Paint&hash=item5194ed2424#ht_698wt_907

http://cgi.ebay.co.uk/Pro-XL-Aeroso...pplies_Paint&hash=item3362abcf02#ht_500wt_922|

Cheers,
Jack

 

[Jack155Q4]

Use a DA with 240 grip paper to "feather out" the stone chips.

Is this sanding disc suitable for this - it is 240 but in the description it says it is aluminium oxide (very different to a P400 W&D I assume!):

http://cgi.ebay.co.uk/240-GRIT-HOOK...owerTools_SM&hash=item335df7aefd#ht_691wt_907

Thanks,
Jack

 

[carlos 318is]

Thanks for this post as I didn't know about the Etch primer will I get any reaction when I put the celle primer over the top

 

[langy]

They look like they are for sanding wood !!! Get them from a reputable Paint factors you will be glad you did !!!
Oh and not all paint factors are reputable !!! some will sell you any old crap.

Mirka gold are pretty good or 3M

Is this sanding disc suitable for this - it is 240 but in the description it says it is aluminium oxide (very different to a P400 W&D I assume!):

http://cgi.ebay.co.uk/240-GRIT-HOOK...owerTools_SM&hash=item335df7aefd#ht_691wt_907

Thanks,
Jack

 

[Jack155Q4]

They look like they are for sanding wood !!! Get them from a reputable Paint factors you will be glad you did !!!
Oh and not all paint factors are reputable !!! some will sell you any old crap.

Mirka gold are pretty good or 3M

Yes, I didn't think they looked right. I found these which look more like it - just need them in 125mm now! Guess I could cut them down.

http://cgi.ebay.co.uk/Box-100-Mirka...owerTools_SM&hash=item2306f5a6e7#ht_500wt_922

 

[langy]

Hmm, what DA are using as all my DA's are 150mm diameter ???

Yes, I didn't think they looked right. I found these which look more like it - just need them in 125mm now! Guess I could cut them down.

http://cgi.ebay.co.uk/Box-100-Mirka...owerTools_SM&hash=item2306f5a6e7#ht_500wt_922

 

[Jack155Q4]

Hmm, what DA are using as all my DA's are 150mm diameter ???

It's this one, - B&Qs own:
http://www.diy.com/diy/jsp/bq/nav.j...rbit&fh_eds=ß&fh_refview=search&isSearch=true

 

[langy]

Hmmm, not for me thanks, Is it dual action ???

 

[Jack155Q4]

Hmmm, not for me thanks, Is it dual action ???

Don't know. I thought random orbit was AKA DA as per http://en.wikipedia.org/wiki/Random_orbital_sander

I could just do this by hand with the P400.