Contrary to what is often frustrating experience, cast resin can also be polished. However, polishing is complex because the rotation of a polishing device always generates heat. The effect of heat on cast resin, especially with epoxy resins, creates "milking" on the surface, which must be avoided.
Polish with cooling and slowly
In general, cast resin as a floor covering in private living areas should not require any polishing. Should polishing become necessary anyway, for example because of acute staining or scratches, a process that takes many steps is unavoidable.
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The least possible heat development must be achieved when polishing. This is achieved on the one hand by limiting the speed of the polishing agent and on the other hand by cooling it with water. As many grit sizes as possible, gradually increasing in fineness, should be used as abrasives.
Work with open abrasives
Unlike other materials, felt is only conditionally suitable for polishing cast resin. It does not dissipate any resulting heat and soaks itself in with cooling water. Abrasives with open structures such as sponges, "clouds " or pebbles are more suitable. Special abrasives for resin surfaces are commercially available.
Some manufacturers' grinding pastes are designed to have a cooling effect during use. Waxes and oils are unsuitable as they form residues that create streaks. It is entirely possible that all attempts at polishing will not be successful if the casting resin has an unsuitable composition. A test run in a less visible place is always advisable.
Grits, intervals and polishing directions
Abrasive pastes for wet processing can be an alternative to other abrasives. The "trial and error" principle should be used here. The possible result of the polishing depends to a large extent on the individual composition and processing of the casting resin. Incorrectly cured resin cannot be polished.
Polishing should begin with abrasives with a grain size of 800 and increase in steps of a maximum of 100 to at least 1200 grain. With lens polishing agents, grinding pastes and constant water cooling, at least two polishing passes should be carried out in each grit level. Changes in direction, for example, across and lengthways and then gyrating are recommended.Tips & Tricks If you need to polish because of the matt or dull surfaces of your floor covering made of cast resin, you should definitely check for any warranty claims. High-quality and professionally processed floors do not become matt or lose their shine.