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Originally Posted by ecollins
Take the piece to the sisal wheel w/black compund. I use a left to right motion. It looks a little shiny after this.
I then move to spiral wheel with brown compound. Again using a left to right motion. I expect piece to look much nicer but it looks duller with more noticeable scratch lines.
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you need to change the angle of the pice to 90' from the black compound step.
This applies to every sanding step also. each finer stage must be applied in a direction perpendicular to the previous stage.
What is probably happening is that you aren't removing the scratches from the rougher stages - in fact you are just making them more pronounced, as the finer grits with just run themselves along the existing scratches. So, when you reach the polishing stages it is just exposing the scratches that are already there.
Sometimes when the piece is big or a weird shape, its hard to do each stage at 90'. The way I get around this is as follows (feel free to suggest a better way though!)...
eg if its a long thin piece...cut on a 45' angle with black compoound, pulling the piece against the flow along its length so that the direction of the wheel is at 45' to the piece.
then with tripoli, do the same but at 45' the other way. the buffing ends up being at a 90' to the previous stage.
hard to explain.