The £44 million turnover group chaired by Dawn Gibbins said all 350 jobs are safe, including the 90 it employs in the UK, and that the deal will enable the company to grow both in the UK and overseas.
Its clients include Wembley Arena, Ascot Racecourse, Bentley Motors, Nasa and Jaguar.
Managing director of Flowcrete and husband of Ms Gibbins Mark Greaves will stay on in his role.
Ms Gibbins started the business in 1982 with her late father Peter and will now work on creating a social enterprise promoting Feng Shui and healthy environments in UK homes and business.
She received an MBE for services to industry in 1994 and the Veuve Clicquot Business Woman of the Year title in 2003.