Author Topic: Sanding, Filling, Sanding, Filling... (Read 2420 times)

Pod · « **Reply #25 on:** August 09, 2006, 10:56:04 am »

Quoting: Jamieg285

I don't have the money or the need to invest in spraying equipment. I'm only doing small repairs.

Me too.
Ideally the whole car needs stripping down to metal and starting again. That's not going to happen for at least a couple of years, so I'm looking to do something to keep it in reasonable shape until then.

Rocky · « **Reply #26 on:** August 09, 2006, 05:31:18 pm »

That upol 2k is expensive we get it in cheaper than that as its one of the high builds we use,however you always need to flat it,we have non sand primers that lay flat with no rubbing down required.
Also if you mix 2k primer you can paint it on with a brush if your going to rub it down anyway.

55starchief · « **Reply #27 on:** August 09, 2006, 05:43:11 pm »

Quoting: Rocky

Also if you mix 2k primer you can paint it on with a brush if your going to rub it down anyway.

yeah done that before

philoldsmobile · « **Reply #28 on:** August 09, 2006, 09:32:31 pm »

hellfrauds stuff isnt as good as u-pol, but it is definatley good enough for a good result..

i did both rear 1/4 panles up to the styling line on the chavscort with hellfrauds product, and the colour match was excelent (actualy, near perfect), after a cut and polish, you really had to look very close to see the repair...

the only one i'd steer clear of is holts, as i have never had a good finish with them.

i think it really comes down to what you are more familiar with, as i've used it more extensively, i could probably get a better finish with halfords than u-pol, not because the product is better, but simply because i'me more used to its behaviour.

Pod · « **Reply #29 on:** August 10, 2006, 09:51:47 am »

Quoting: philoldsmobile

i did both rear 1/4 panles up to the styling line on the chavscort with hellfrauds product, and the colour match was excelent (actualy, near perfect), after a cut and polish, you really had to look very close to see the repair...

How does primer affect the colour?

Or are you talking about paint now?

55starchief · « **Reply #30 on:** August 10, 2006, 09:52:55 am »

Quoting: Pod

How does primer affect the colour?
Or are you talking about paint now?

I think he is talking about paint now

philoldsmobile · « **Reply #31 on:** August 10, 2006, 05:03:53 pm »

i didn't prime the panel other than localy around the repair, as it was matching like for like colour..

its actualy not advisable to prime the entire panel if the area yyou are painting is being maked off, as its often possible to see the primer in the masking line. if you do this, prime, then de mask and blend it all in, and overlap the final colour past the primer line.

provided you have flattend all hint of shine with 600 - 800 grit wet and dry (used wet) there will be no problem with the paint keying

Jamieg285 · « **Reply #32 on:** August 10, 2006, 07:37:58 pm »

The water's done the trick, totally different sanding experince.

Also found some U-Pol spray in Halfrauds, so I bought some ready for the next patch that I attack

55starchief · « **Reply #33 on:** August 10, 2006, 07:39:08 pm »

Quoting: Jamieg285

The water's done the trick, totally different sanding experince.

did you add some washing up liquid? as it helps it to cut

Jamieg285 · « **Reply #34 on:** August 11, 2006, 08:04:18 am »

Quoting: 55starchief

did you add some washing up liquid? as it helps it to cut

Yep. Sanded and put the 1st layer of white primer on last night.

I assume the next step is to wet sand again with 800 or higher and put another white primer. Then finally 1200 it and top coat.

55starchief · « **Reply #35 on:** August 11, 2006, 08:06:00 am »

Quoting: Jamieg285

I assume the next step is to wet sand again with 800 or higher and put another white primer. Then finally 1200 it and top coat.

shouldnt need to go much above 800 wet flat before top coat then color sand with 1200 before compounding with something like G3

Jamieg285 · « **Reply #36 on:** August 11, 2006, 08:18:10 am »

I wanted to put another white on, to make sure I've covered the filler primer and won't get any beige areas showing through.

What's color sand and G3?

Don't I need to wait a couple of weeks before compounding(whatever that is)

55starchief · « **Reply #37 on:** August 11, 2006, 08:21:17 am »

Quoting: Jamieg285

I wanted to put another white on, to make sure I've covered the filler primer and won't get any beige areas showing through.

What's color sand and G3?

Don't I need to wait a couple of weeks before compounding(whatever that is)

Shouldnt need to build up with primer just go straight over with the top coat.

color sanding is when you wet flat the top coat to remove any inperfections but its done with a fine paper 1200 usualy and dont go crazy otherwise you can go through

G3 is a cutting compound and can be bought from any bodyshop supplier

Would leave the paint a couple of days if its gonna airdry before color sanding

Jamieg285 · « **Reply #38 on:** August 14, 2006, 03:06:14 pm »

Colour sanding - with a block? Hand? Other?

55starchief · « **Reply #39 on:** August 14, 2006, 04:13:43 pm »

Quoting: Jamieg285

Colour sanding - with a block? Hand? Other?

You want to get a rubber sanding block mate

philoldsmobile · « **Reply #40 on:** August 14, 2006, 04:24:54 pm »

beware of corners though, its VERY easy to rub through the paint.. also, on curved panels, go at it by hand, and block only on flat areas..

Jamieg285 · « **Reply #41 on:** August 16, 2006, 10:54:44 am »

Well that didn't go as well as I'd hoped.

Put the colour on, left it for a few days. Looks OK up close, feels rough, and looks rough from an angle.

Did a bit of colour sanding - very light, just a little bit all over.

End result is it still looks rough. Not sure where I've gone wrong. Not thick enough on the colour? Too much sanding? Too little sanding? (without seeing it done properly, I don't know how much is right)

Any suggestions?

55starchief · « **Reply #42 on:** August 16, 2006, 11:10:27 am »

Quoting: Jamieg285

Well that didn't go as well as I'd hoped.

Put the colour on, left it for a few days. Looks OK up close, feels rough, and looks rough from an angle.

Did a bit of colour sanding - very light, just a little bit all over.

End result is it still looks rough. Not sure where I've gone wrong. Not thick enough on the colour? Too much sanding? Too little sanding? (without seeing it done properly, I don't know how much is right)

Any suggestions?

Again without seeing it mate i cant comment. Body work is all about feel you really need to use your hands and feel for anything that might create a problem later.

Jamieg285 · « **Reply #43 on:** August 16, 2006, 11:22:12 am »

I've done a bit of reading elsewhere, and I think it's just my expectations. I was expecting it to look even and shiny after the sand, but I've read it should be matt, and in need of a cutting compound.

I think I will put another layer or 2 of colour on tonight, then buff it at the weekend.

55starchief · « **Reply #44 on:** August 16, 2006, 11:25:15 am »

Quoting: Jamieg285

but I've read it should be matt, and in need of a cutting compound.

Ah yopu didnt compund it that makes sense need some G3 compund and a lot of rubbing before it shines

Jamieg285 · « **Reply #45 on:** August 16, 2006, 11:33:59 am »

Quoting: 55starchief

Ah yopu didnt compund it that makes sense need some G3 compund and a lot of rubbing before it shines

Can that be done by hand, or should it be done with a buffer?

55starchief · « **Reply #46 on:** August 16, 2006, 11:37:55 am »

Quoting: Jamieg285

Can that be done by hand, or should it be done with a buffer?

depends if you want your arm to drop off mate

Jamieg285 · « **Reply #47 on:** August 20, 2006, 05:02:19 pm »

Poo.

Gave it a bit of a hand polish with T-cut colour restorer today to try and get some shine. Good is it's working.

Bad news is, it's showing up a horrible colour difference. The old paint has buffed up brighter (a lot brighter) and there's almost a visible line between the two. I tried buffing some more, but that just increased the size of the bright patch.

I figure I'm going to have to blow over that part again, and do a better job on positioning the 'join'.

How much do I need to do know? Is it a case of scuff up (with what grade?) and paint straight away, or should I sand it back a bit more (again what grade?) and add a layer of primer?

55starchief · « **Reply #48 on:** August 20, 2006, 05:28:23 pm »

Just wet flat with 800 wet and dry then dry off before spraying. If you have some panel wipe wipe the panel to remove any grease from your fingers or i think you cn use white spirit

Jamieg285 · « **Reply #49 on:** August 20, 2006, 06:00:35 pm »

Quoting: 55starchief

Just wet flat with 800 wet and dry then dry off before spraying. If you have some panel wipe wipe the panel to remove any grease from your fingers or i think you cn use white spirit

Weather permitting, I'll give it a go tomorrow.