The whole ‘filler’ debate can be both frustrating and confusing. With any polish, at any given time, despite perfecting our technique to the umpteenth degree we can all experience filling that is literally out of our control.
It has been my experience that 3M Ultrafina/Ultrafine polish is no exception and is likely to have some level of filling as it does leave behind a very tough and durable film on the paint. Whether any defects return after the film is removed will depend on how well the paint is polished underneath. Ultrafina/e absolutely has the ability to leave a ‘perfect’ (as defined by having no visible marring in direct sunlight) finish with good technique on most paint systems with out issue.
I have been as frustrated with the whole filling thing as anybody, which is why I have researched it pretty thoroughly, although I still have far from all the answers. To be honest I have more questions then answers. If anything I say is incorrect I am open to learning more so please feel free to jump in!
Most polishes fill primarily because they use various types of petroleum distillates as a carrier for the solid abrasives. These carriers have to adhere to the paint somewhat so that the polish can be worked against the paint instead of pushed across it. If a foam pad moving across the paint at roughly 1,500 feet a minute (6 inch pad @ 1000 rpm) under pressure cannot move the oil off the paint then a micro fiber rag and your hand is going to have a hard time.
This isn’t to say that some polishers are harder to remove then others, but if the oils in the polish are doing a good enough job to allow you to create a visually perfect finish while moving abrasive grains across the paint, they are likely going to be difficult to remove completely with out using a clean micro fiber (and switching to a clean one often) . To make matters worse, some oils and carriers can bond to the paint and be very difficult to remove, particularly when applied with heat and pressure. Given the huge variety of paint systems (and the variables inherent to their application) can lead to some products unintentionally filling on particular paints.
I have experienced Ultrafina filling prior and have seen it do a pretty admiral job of concealing some pretty severe defects on certain paints, recently with David Fermani. Like just about anything related to detailing, there are no hard rules. I have also seen Ultrafina fail to hide even the faintest micro marring. It’s the reasons most professional detailers that I know keep a somewhat varied arsenal of products: Something’s just don’t work on some paints.
Another reason that you can get (unintentional) filling is because polishing paint can cause the paint to expand slightly (similar to how it expands in direct sunlight). If you think about wrinkles on the top of your wrist: Pull the skin tight (apart) and the wrinkles disappear.
Now there are a number of techniques we can all use to make sure defects don’t come back, but nothing is full proof.
Inspect the paint after each step of polishing. Even this isn’t as straight forward as we like it. Certain polishes (applied in certain ways on certain paints) can be difficult to remove with certain products and easier to remove certain products. This can flip-flop depending on the infinite number of variables. I used to use solvent frequently, but now use a 70 percent alcohol wipe-down as my mainstay. Some polishes can take multiple wipe downs.
Speaking of alcohol wipe downs, even they aren’t effective all of the time, but they do require a certain technique. Misting the surface with spray then wiping like a window may not work. As the alcohol evaporates, or as the towel becomes soiled with residue, you can end up re-depositing the product you are trying to remove. Liberally soak the panel with alcohol then agitate with a micro fiber cloth , then wipe clean with a fresh, clean micro fiber. Flip your towels (wiping and cleaning) frequently. Sometimes certain strength mixes of alcohol can act funny on certain paints with certain polishes. If there is too much alcohol it can flash off very quickly leaving a cloudy, difficult film of product behind, if it is not strong enough it can be like wiping the paint with.
Which leads to the other issue on this thread. Can a product survive multiple wiped owns with a strong solvent but be removed with soap/water? After doing this full time for the last three years, I would say absolutely. When we remove anything from the surface we have to release it, then find a way of a removing it. If the solvent is flashing quickly, the product could be re-deposited before it is removed. Also, some products are extremely chemical resistant but can be removed easily with abrasion, and vice a versa.
As far as David suggesting that Ultrafina can survive paint thinner wipe downs, I would say that most of the time it would wipe right off. However, I believe he is referring to a Rolls Royce Drophead that we polished last month. We didn’t have a lot of time (a lot of work lined up) so I started with Ultrafina on a black 3M waffle pad to see what it would do. It made the finish look amazing, in one pass, with no holograms. If you would have seen the condition of the paint before common sense would dictate that this was nearly impossible unless the paint was butter soft. We wiped the test spot with alcohol, perfect. A second wipe down: perfect. David had some solvent (it might have been paint thinner, I didn’t read the label) and wiped it, perfect. We shrugged and figured it was our lucky day.
We pulled the Phantom in his garage and washed it with dawn, dried it, and we noticed almost all of the scratches returned, even in the light of his garage… Weird? Yes, but I am sure that many of us have experienced just weird stuff that flying in the face of logic. Apparently the dawn in combination with the agitation of being washed, removed the product, and the water flooded it away. Maybe the paint temporarily swollen?
So at the end of the day there are just to many variables to make concrete statements. If Ultrafina/e works well with your situation then more power to you, that’s all that matters. My two cents on the whole discussion.