Hello again Leon,just loged on for a look at your Tempest build thread ,and i must say dipite your twenty year lay of from modelling, you've still maintaned a high level of modelling skills.
A solution to the runny yellow could be,use fast drying acrylic paint and spray from a little further away, dusting the paint on rather than a wet coat.As others have commented paint seeping under masking tape seems to be a common problem .I have to constantly check every time i use masking tape that it has'nt lifted,and burnish acordingly.
talk more next month.
TTFN, Regards Barry.