Nigel,
I use the same product as Chuck, and highly recommend it. I use small "throwaway" hobby brushes (the all plastic ones in the blister pak, easily found on line) to apply as he does allowing it to flow into the CA by gravity or capillary action, otherwise you'll end up with a great 3 way glue joint; the line, the structure, and the brush! I've found it can damage paints that are not dried/cured, especially enamels. Once dry they seem unaffected.
Cheers,
Lance