I used epoxy and harder from a dutch company called polyservice.
http://www.polyservice.nl/Poly-Pox-GT-600-5-kg-thixotrope-epoxyhars--p-16185.html
I used Polypox GT 600 as epoxy with Polypox 355 as hardener
It's without solvents and I've already made a few backgrounds with it without any problems. The oldest ones about 8 years old by now.
The picture below is an example of my old tank which I built in 2002.
The epoxy itself is transparent so I mix it with some black pigment. Other colours are also available.
When hardened the epoxy coating is quite shiny. And stays shiny.
That's why I always use sand (terrarium sand for my plywood tank) and put a thin layer of sand on top of the epoxy (when it's still wet). That gives the background a natural look without the epoxy shine.
The tank in the picture is made in the same way but then using 0,8-1,25 mm filtersand used in swimming pools. The problem with this background was that the colour is a bit too bright so it was quite difficult to achieve a sense of depth in the tank. Later I coloured the background darker and that was a lot better.
http://www.polyservice.nl/Poly-Pox-GT-600-5-kg-thixotrope-epoxyhars--p-16185.html
I used Polypox GT 600 as epoxy with Polypox 355 as hardener
It's without solvents and I've already made a few backgrounds with it without any problems. The oldest ones about 8 years old by now.
The picture below is an example of my old tank which I built in 2002.
The epoxy itself is transparent so I mix it with some black pigment. Other colours are also available.
When hardened the epoxy coating is quite shiny. And stays shiny.
That's why I always use sand (terrarium sand for my plywood tank) and put a thin layer of sand on top of the epoxy (when it's still wet). That gives the background a natural look without the epoxy shine.
The tank in the picture is made in the same way but then using 0,8-1,25 mm filtersand used in swimming pools. The problem with this background was that the colour is a bit too bright so it was quite difficult to achieve a sense of depth in the tank. Later I coloured the background darker and that was a lot better.