HOUYI EXPANDING FOAM SPRAY FOR AQUARIUM SCAPE DIY 3D BACKGROUND FOR AQUARIUMS, VIVARIUMS AND TERRARIUMS. Features and Benefits: Houyi Expanding Foam is a high tech material specially developed for ecological landscaping. This material will be expanded and cured in the presence of moisture in the air. It is equipped with a plastic adapter, which makes scape easy and more convenient, greatly improving the user#@#s control. Quick to harden and easy to use; just shake well and spray! Safe for aquariums, vivariums and terrariums livestock and plants! Good adhesion to a wide variety of surfaces such as uPVC, masonry, brick, block work, glass, steel, alluminium, timber and other substrates (except PP, PE and Teflon). Contains CPC-free propellants which are harmless to the ozone layer.