That's a tough situation as certain paints/sealants simply don't like to stick to each other.



One choice is to put a plastic material down. You could cut up fiberglass reinforced panel (FRP) or Sintra or some of the self adhesive vinyl film used in the graphics industry. Or even some scrap vinyl flooring. In fact I would do this for the floor of the cage regardless as this is where urates, feces and water spills will do their most damage.



If you really want to paint something over the walls I'd use a seal coat to act as a barrier. The most readily available is Zinsser's Seal Coat which is de-waxed shellac. You can buy it in spray cans or in small cans to brush on. It will stick to just about anything and just about anything will stick to it. So even if the current coating and your desired coating are incompatible the seal coat will work inbetween them.



Before I continute, what sort of look do you want for the cage interior? A solid color, a clear coat, or what?
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Current snakes:



0.0.1 Gonyosoma oxycephala - Java locale (green)



2.2 Gonyosoma janseni - Seleyar locale (all black)

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