Future is always an easy way to seal things off. If you need to get serious move up to an isolator like U-pol Barcoat
http://www.u-pol.co.uk/documents/datasheets/tds/BAR-TDS-EN.pdf
I've encountered that on more than one occasion on different kits. That coating can be difficult to remove.
I've found That Tamiyas' ' plastic friendly ' Lacquer thinner #87077 to be the most effective against it.