Combined with good drainage and a quality potting mix, sealing the inside of pots will increase their longevity and appearance over time.
All our outdoor pots can be planted directly into and have been sealed at the factory to reduce moisture loss through the porous structure of the pot. However, you can apply additional sealer to the inside of the pot but it is not strictly necessary:
If you want to maintain as close to an "as new" finish for as long as possible, you could consider applying an additional sealer. This will reduce the moisture coming through to the outside of the pot which may over time affect the appearance.
On light coloured pots this reduces the chance of leaching that may occur from some potting mixes.
In some cases this matters, in other cases it doesn't. If it would matter to you then seal the inside of the pot with an all purpose pot sealer. Something like Yates Pot-a-Seal or Cromellin Ornamental Sealer is fine, it can be brushed on sprayed via aerosol and is available from most hardware stores.
We recommend the application of additional sealer to pots used in commercial installations. We recommend bitumen sealer such as Ormonoid as the best option so that the pot does not absorb water. Latex sealers will also work.
This combined with good drainage will get maximum life from the pot. You can also look at Painting Our BalconyLite Fibreglass Pots for maintaining or altering the exterior finish.
If you have any questions about this, we're happy to help and provide advice. Please Contact Us.