Rustins aluminium paint 250500ml rustins alptw500 this 500ml tin of aluminium paint from rustins is an alkyd based oil paint which can be applied over existing paints on wood and metal particularly good for protecting exterior steelwork and made with leafing grade aluminium for extra water resistance one coat is usually sufficient though a second coat may be applied if required touch dry in approximately 4 hours depending on temperature and humidity second coat may be applied after 12