▎ 摘　　要

NOVELTY - Non-conductive substrate being at least partially coated on at least one side with a paint comprising reduced graphene oxide and at least one thermosetting polymer, is claimed. The non-conductive substrate is directly coated by the paint. USE - The paint coated non-conductive substrate is useful as a textile or a plastic substrate and for detecting a leak and a strain deformation (all claimed) and in mining industry, electronic industry, plastic piping systems, clothing industry and engineering plastics used in automotive and aerospace industry. ADVANTAGE - The paint coated non-conductive substrate: has high conductivity and high sensitivity and improved life time characteristics; and is deposited with paint which is an easy and simple system to allow the detection of leak and strain deformation. The method does not need very sensitive strain sensing devices for monitoring a state of such products for early detecting a defect that occurs in an extreme situation e.g. natural disaster (e.g. earthquake) or in a usual situation (e.g. wear). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) manufacturing the non-conductive substrate being at least partially coated, comprising (a) mixing reduced graphene oxide, thermosetting monomer, curing agent and optionally solvent, (b) depositing the mixture on non-conductive substrate and (c) curing; (2) detecting a leak with the non-conductive substrate being at least partially coated or obtained by the method as per se, comprising (a1) applying electric voltage to the non-conductive substrate being at least partially coated using an electronic system and (b1) detecting a leak when the electrical circuit is formed in the non-conductive substrate being at least partially coated; and (3) detecting a strain deformation with the non-conductive substrate being at least partially coated or obtained by the above method, comprising (a2) applying electric voltage to the non-conductive substrate being at least partially coated using an electronic system and (b2) measuring the electrical resistance variation after deformations of the non-conductive substrate being at least partially coated.