Reply to: RE: [VAC] The Holographic effect
rharper wrote:
>.......
>I have done some experimenting with my Porter-Cable 6" random orbital
>variable speed sander (using a buffing pad), both with the green-ox and the
>Rolite pre-polish, and found it to be too timid. The orbital action of the
>head robs much of the power of the circular motion. I will try this again
>at the next step (Rolite metal polish), but from the tests I have done so
>far with the 3-stage Rolite system and the 7", I think it will work out OK
>using only the circular buffer.....
Thanks for the heads-up Bob, I've been admiring the DeWalt 7" buffer/sander, now I
have an excuse to get one!
>RE: the "hologram" effect, I have to disagree with RJ. Or maybe more
>correctly I should say that you don't have to use sandpaper to get the
>"hologram" effect............ I used the pre-polish on my 7" x 12"
>piece (3 or 4 applications) and brought up a great shine and a great
>hologram effect. I move on to the metal polish stage, and improved the
>shine, but still had the hologram effect. Only after 3 applications of the
>metal polish and total wipe-downs was I able to make this effect 95%
>disappear........
I think you are correct Bob, it's not just the sanding marks causing the fine
scratches. I'm sure the source of the hologram effect is the combination of scratches
amongst a mirror finish, that's why it disappeared by toning down the polish. I think
scratches were being introduced whenever the "mud" (alum oxide and old polish) caked
on the foam pad. Around & around it went, making tiny scratches. I also used the
Pre-Polish (the regular polish doesn't cut as fast & build-up) a lot more on the
previously sanded areas, probably causing the effect to even be more pronounced on
these areas.
How to avoid this? Towards the end, I was using a spray bottle with mineral sprits to
keep the pads from loading up or caking. It is also important to not work on a hot
skin surface, as that dries the polish onto the pads very quickly.
I'm ready to do another now!
>
>At this point this finish is VERY finicky and I think very fragile. Just
>the direction of a wiping action (soft cotton wet with paint thinner) leaves
>lines which show under bright focused light. This is very, very shiny, but
>it is still very soft aluminum. Is it worth it? Jury still out .... Still
>a long ways to go to produce this kind of shine on the whole trailer.
It is because dust, water spots and natural oxidation shows up so readily on a mirror
polish (post AP-300), that we are going to stick with the Rolite Polish being the
final finish, sealed with the Rolite sealer. We'll see how this strategy works going
into year 2 now.
RJ
>
>BH62GT/SC
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