Acrylic Polishing


The technology of the Aquarium Polishing Robot allows it to maneuver freely on any smooth surface, vertically as well as upside down, while staying attached to the surface. At the heart of the robot you will find its patent pending technology which enables it to polish uniformly the windows of the aquarium by controlling the pressure of the polishing pad against the surface. The inner processor controls how much material is being removed as the robot travels to the surface. The robot can be remotely controlled by the operator. In addition it can maneuver in automated patterns.

Aquarium Polishing Robot

Aquarium Polishing Robot

The Polishing Robot has three polishing discs that allow the operator to operate the robot with up to three different grain sizes or just three of the same. Changing the disc under water is done comfortably at a push of a button. Consequently the operator needs to surface the robot every 2-3 hours. The operation of the robot itself is a piece of cake. Feel free to take advantage of the semi-automatic system reducing the intensity of operating the robot significantly as it automatically keeps on the track with the help of advanced sensor technology.


So far all traditional underwater polishing methods were done unevenly and with differentiated pressure on the windows. All those methods leave the glass or acrylic window with dents which are the common fish-eye effects. At that point the spectators experience the objects changing size as they move behind the glass. AQRO’s polishing robots eliminate this effect and the aquarium visitors can enjoy the habitat without any visual disturbances. The acrylic window is again like a brand new one!


With AQRO’s robots the need for a diver to do the polishing is becoming obsolete and reduced only to those special situations where the job cannot be handled by the robot. This is safer, cheaper, faster and much more flexible, while it makes the job of the operator relatively easy. There is no need to refill air bottles and suit up for hours and hours in the water for this rather boring work. There are no repetitive work postures, neither danger for arthritis nor the chance to get hurt by dangerous animals. No observer is needed and no rescue diver needs standing by. These unnecessary costs and risks now belong to the past.

Acrylic polishing robot

Acrylic polishing robot remotely controlled and guided by lasers.



Colorless transparent acrylic PMMA sheet has a light transmittance around 92%. It offers clearer views than glass and therefore even minor scratches are visible. A dry side scratched acrylic surface should not be sanded unless the imperfections are too deep to be removed by abrasive polishing and buffing alone. If sanding is required, we recommend to use wet sanding.

Acrylic polishing from the dry side

Polishing the acrylic window from the dry side

The process of polishing properly acrylic sheets is highly detailed and time consuming, therefore, all the steps need to be completed and examined via angle light flow. For very deep scratches and acrylic chip repairs, a 200 sandpaper grit will be coarse enough to start the sanding process. To avoid deflection of the repair, the minimum sanded area usually should be about 100cm2. Upon completion of the sanding, our acrylic polishing technicians process to the application of the appropriate abrasive to buffer the acrylic panel to perfection. Where power operated polishing equipment is not available, the above process is feasible to happen manually.


A wet side scratched acrylic surface can only be polished by sanding. Sanding the acrylic panels while there are live organisms in the pool is feasible but needs to be applied with caution. The repair will produce acrylic shavings that might be harmful to gills and filter-feeding animals. However an AQRO robot absorbs all shavings out of the pool, leaving the aquarium habitat undisturbed.


At AQRO we use orbital sanding and non-orbital sanders powered by air which are constantly connected to water supply for smooth polishing. Sanding with water produces a smoother finish, allowing the polisher to use fine-grit sandpapers up to 16.000 grit, bringing the acrylic sheet back to its full transparency finishing. Without the use of water, fine-grit sandpapers will fill up and over-heat the acrylic, creating a deep damage on the surface. The friction of buffing and polishing/sanding generates heat to soften and potentially burn the acrylic surface resulting in visual distortion.

Wet Acrylic Sanding

Wet Acrylic Sanding

Aquarium Polishing

We can polish either acrylic or glass windows for any scale of aquarium project.


Our polishing robots can now polish curved surfaces down to the radius of 1 m. We provide uniform polishing and amazing views with no fisheye effect. We ensure maximum visibility and of course minimum intervention and disturbance to the habitat. Therefore this allows any aquarium to polish the windows in any season. No diver in and out of the water for many days. No pressurized air changing the chemistry of the water and disturbing the fish and the sight of the visitors. Just the robot maneuvering slowly over the surface, again and again, covering up to 6 m2 per day, minding its own business, adding to the experience of visiting an aquarium.


For excellent wet side polishing quality results, AQRO’s robots are operated by AQUALIFE and ASI acrylic finishing technicians. Please refer to our packages and do not hesitate to contact us for free consultation.