Robotech it's possible some areas are painted, or at least top coated. if the coat is semi gloss or matte it might be a problem, not just clogging but also potential staining as it's difficult to wipe away excess panel lines on non-smooth surfaces the ink will dry up on the spot.
so if you can use 0.03 pen instead of 0.05 it will greatly reduce the chance of excess panel lining it can also reach narrow places. so far there's only Black for 0.03.
if you panel line painted parts you need to apply a gloss coat to ensure the surface is smooth and excess can be wiped. even if you failed to wipe it off, you can scrap the excess off with hobby knife without damaging the paint. the problem is you need to apply another matte coat if you want to use weathering powder for shading because they don't stick on gloss surfaces.
thus i suggest use cheap clear lacquer gloss cans from hardware shop to keep the time short & cost low.
gundam panel markers also leaks easily around the tip after a while and the tip easily fuzz out.
also do not bother about those sharpie/stabilo markers the inks won't dry up on plastic and will turn into smudge when you top coat them.
indeed. thumbs up.
sharpie gg. tried it once (luckily on a test gundam ) else cry until no tears