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The marble has probably been scratched by the underside of the door. First, trim the door bottom so that it does not scrape on the marble. Then have the dull spot refinished and polished. You will probably need to start with a course abrasive(60#).... Read More

You may want to recommend to your customer that having the edges rounded would help prevent further chipping. The edge can be rounded using a course diamond abrasive on a small electric hand machine. You can also put a profile on the edge using a... Read More

It is very difficult to hone a granite floor without removing the lippage. If you do, the result will be an uneven shine. When granite needs honing and polishing the damage is relatively deep and will require starting with at least a 60 grit abrasive... Read More

Diamonds and bricks both work well on granite but the final results will depend on the skill of the operator. Generally bricks require the use of an Italian grinding machine and a much higher degree of skill than diamonds. Diamonds are much easier to... Read More

No, you didn’t do anything wrong. When granite is sandblasted the force of the abrasive destroys the crystal structure of the granite. This is why you are seeing a blotchy appearance. Unfortunately the damage has been done and there is very... Read More

There are several tricks you can use to hone and polish the marble without touching the granite. The best method is to cover the granite insets with duct tape. If you use resin bond diamonds starting at a 120, the diamonds should glide over the duct... Read More

If the marble has only been recrystallized a few times it is possible to powder polish over the recrystallization. The powder will remove the recrystallized surface . If the marble has been recrystallized heavily, powder polishing may be able to be... Read More

This will depend on what grit you are using. Recent studies performed by several abrasive companies have shown that honing of marble removes the following amount of material: Grit size Average amount removed(inches) 120 .0019 400 .0008 800 .0001 1800... Read More

Never use a angle grinder to hone and polish any stone. Angle grinders have speeds that exceed 10,000 rpms and are too fast for honing and polishing. These high speeds will also destroy your diamond abrasives. TIP If you have right angle grinder you... Read More

I am assuming that you are talking about burnishing a floor in speeds of 1500 rpm and higher. This is a typical maintenance procedure for certain types of floor finishes and is also used on stone flooring. I have not seen any articles or research on... Read More