Clear pondtite clearly states on its labeling that it is not flexible or designed to be applied to flexible surfaces. Not even fiberglass ponds. The tiniest bit of flex will cause pondtite to crack. Painted foam is too soft and will flex easily and get hairline cracks and leak, hence the reason so many of us coat the foam in render/cement or grout use oxides to colour the render and just use minimal paint for highlighting prior to
sealing !
direct from bondall website:
PONDTITE CLEAR
DESCRIPTION
[FONT=YHSKAS+Swiss721BT-RomanCondense][FONT=YHSKAS+Swiss721BT-RomanCondense]Bondall PondTite Clear is a brushable product that forms a tough, seamless, waterproof coating for water bearing objects. It is suitable for use on masonry surfaces only. It is environmentally friendly, simple to use and easily washable/cleanable
Bondall PondTite Clear (unlike the PondTite colour range) is a non-flexible product that will not allow for any surface movement. When using PondTite Clear, it is therefore essential that the surface area is of high quality. If the surface is questionable, PondTite Clear is not suitable for use and a PondTite colour-based product is recommended as an alternative.
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[FONT=YHSKAS+Swiss721BT-RomanCondense][FONT=YHSKAS+Swiss721BT-RomanCondense]√ Ideal for: Fish ponds
Bird Baths
Water features
Holding tanks (non-potable) (not for human consumption)
Reflective pools
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X Not intended for:
Swimming Pools
Fountains Spas
Glass or fiberglass
Glazed or semi-glazed surfaces
Plastic, metal, wood
Painted surfaces
Yes it's shiny, small price to pay for easy clean. You'd only add a bit of sand to it if you had small lizards/ geckos running over it. My 1.5 meter pythons don't find it a problem. As for the colour change I'd suggest it's caused by the excessive heat. One of my tanks has had pondtite for 2 years and suffered no discoloration in the slightest !