Could this be used to hide what i think is rising damp where paint has flaked leaving powdery plaster underneath?

Would certainly hide it. But if it's rising damp it needs sorting,not hiding

Can i wallpaper over it?

Yes you can wall paper over it make sure y put lots of paste on it other wise u get lots air bubbles

Will this work to prevent condensation forming on a basement wall which has been tanked?

From my own experience I tanked an external solid wall, wall and then put this on. It has made a difference to the room in term of warmth and no longer smells of damp. It was then overlaid with a moulded wall paper. Seems ok so far at a year in… Good luck

Manufacturer	Wallrock
Part Number	EMWRDST
Package Dimensions	59.4 x 42.4 x 6 cm; 500 g
Item model number	EMWRDST
Colour	Grey
Style	Modern
Material	Paper, Polypropylene
Installation method	Non-Pasted
Item Package Quantity	1
Number of Pieces	1
Coverage	5 square meters
Batteries included?	No
Batteries Required?	No
Item Weight	500 g

Wallrock Dampstop Thermic Roll

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