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There's a about a 6 micron difference between a 2000 and a 4000 grit. Abralon pads are graded using the tighter tolerance FEPA "P" scale. A Abralon "P 2000" grit pad is about 9 microns, which is between 1000 and 1200 USA "ansi" grit. A Abralon "P 4000" grit pad is about 3 microns, which is about a 1500 USA "ansi" grit. Grits can vary a lot, this is do to the different tolerance ranges used by different company's and association's.
Thin transparent layer that protects the eye from grit and dust
Sand the fiberglass with a 400 - 1000 grit sandpaper so you can not feel a difference between the fibergass filler and the body of the car. Now you can prime it.
Newtons law says that a moving object wants to keep moving unless it is slowed down and stopped by some force. We use the word 'momentum' to express an object's ability to keep moving. Moving objects on sloping surfaces are slowed down by 2 natural forces. These forces are friction and wind resistance. If 2 Billy Carts are built exactly the same shape and style and have the same size wheels and same type of bearing and tyre, then they should move down the hill at the same speed; BUT, the one which is heavier will have more momentum because of it's extra weight. This means that it has more capacity to keep moving and it will therefore have more ability to overcome the resistance of the wind and the resistance to grit and bumps on the road surface. In reality, they are usually given a push to get started when in a race. The heavier one will be given much more momentum because it is heavier, so it has an unfair advantage when they all have a 'push start'. If the rider keeps his head down low and streamlines his clothing and helmet, he could win the race because it is all about the cart which causes the least wind resistance. Steel wheels and precision ball bearings, and large diameter wheels, is usually the secret to winning the race , because friction is the main force that slows down the Billy cart. Large wheels overcome grit and bumps in the road much better than small wheels.