Sanding epoxy resin - this is how it works

Epoxy resin is used in many different areas of application. Whether a stone carpet is created with it or whether decorative elements for the aquarium are to be sealed, epoxy resin is the product of choice. The epoxy resin was mainly known in boat building and here it is still mainly used for repairs.

Sanding - but slowly

Regardless of the area in which epoxy resin is used, it can be filed, drilled and sanded. But basically only when it is completely cured and not only dried. If the material is sanded earlier, it can be milky and greasy. This damage can usually not be eliminated later.

  • Also read - laminating epoxy resin
  • Also read - is epoxy resin food safe?
  • Read also - seal concrete with epoxy resin

Step by step grinding epoxy resin

  • Grinding paper in different finest grainings
  • Polishing paste (9,45 € at Amazon *)
  • Mouthguard

1. Process epoxy resin

Process epoxy resin exclusively in cold rooms. Never should be worked with the resin in the sunshine. The material would dry too fast and form thick lumps. These do not only dry heavier, they partially discolor themselves when drying.

Once milky or spotty inclusions have formed in the epoxy, you can sand as much as you want, these layers must be removed.

2. Do not dry - harden

It can take up to a week to cure an item that has been coated with epoxy resin. You have to sit it out, because the resin is quite dry beforehand but is far from being sandable.

3. Grind wet and cool

Sanding makes epoxy warm and can then smear something. Therefore, it needs to be cooled when grinding. So it's important to keep adding cold water when sanding epoxy.

4th. Don't skip any grit

As stressful and time consuming as it may be, you shouldn't skip a grit if you're looking to cleanly sand epoxy. The fine scratches that occur during sanding cannot be sanded out of the smooth material if you skip individual grits.

Tips & Tricks If your workpiece is also to be polished to a high gloss after sanding, you have to stick to the finest sandpaper and then polish a few more times with polishing paste and regular cooling. In between, rinse the workpiece with cool water and check whether the shine is already strong enough.