Going through the grits What does this mean?” No it’s not a reference to eating breakfast in Georgia!
It’s a very similar idea to ‘Least aggressive first’ it refers to the process of using different grit finishing papers of progressively finer grit or foam / wool pads with progressively denser pads to get a smooth finish.
By going through the grits each progressive piece of grit finishing paper or pad removes the scratches from that previously used. Always start with the least abrasive combination, i.e. a machine polish and the least aggressive foam or wool pad.
Always choose the least intrusive product, it is preferable to polish 2-3 times to restore the paint film surface than to use an unnecessarily abrasive machine polish / foam pad combination. Before commencing polishing do a test panel on the car, once you have achieved the desired results with the chosen polish / pad combination proceed
Grit Numbers
Sandpaper or finishing paper is the most common item from a larger group of products known as "coated abrasives" i.e. Aluminium oxide. When talking about "grit" is a reference to the number of abrasive particles per inch of finishing paper (sandpaper). The lower the grit the more abrasive and conversely, the higher the grit number the lesser (smoother) the finishing paper
When talking about abrasive finishing paper, "grit" is a reference to the number of abrasive particles per inch of paper. It eliminates the risk of deep sanding scratches by providing a uniform grit size. The lower the grit numbers the rougher the paper and conversely, the higher the grit numbers the smoother the paper.
This makes sense if you imagine how small the grit particles on a 1000-grit finishing paper would need to be to fit into a 1" square. Grit finishing paper is referred to by the size of its abrasives (i.e. 1500-grit paper) the grit you use depends on what you are trying to do.
a) Polishes have a grit number) most polishes will state the level of scratch removed by stating grit numbers i.e. will remove 2000 grit scratches caused by using 2000 grit finishing paper
b) Foam Pads are also rated on a grit number, that is to say the scratches they will remove after using grit finishing paper along with a similarly rated polish (i.e. 2000 grit rated pad and polish will remove the marks left after using 2000 grit finishing paper)
Once you have identified the scratch ‘grit’ marks you can match a polish and a foam pad (i.e. 2500 grit marks, require a polish that is capable of removing 2500 grit (number) marks, matched with a suitable cutting pad (e.g. Menzerna Power Finish (PO203S) this is a one-step scratch remover polish that will remove 2500 grit, matched with a LC White Light cutting foam pad
1. 1000 < grit Heavy - (Compound) levels and removes heavy defects
2. 1200 grit Heavy - levels moderate to heavy defects
3. 1500 grit Medium - levels light to moderate defects
4. 2000 grit Moderate - levels light defects and removes hazing
5. 2500 grit Light - levels swirl marks, light defects and removes hazing
6. 3000 grit Fine - very minor corrective ability, burnishes paint to high gloss
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