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Should work, as would Vallejo's Plastic Putty or the solvent-based equivalents (Squadron Green/White, etc.). The water-based putties (LGS/Vallejo) shrink as they dry, so you may need to apply in layers or overfill and sand it flush after curing (be sure to let it cure fully - if you mess with it while it's merely dry, you'll peel it off instead of abrading it down).
There are plenty of other ways to do it, of course. Two-part epoxy putties (GS, Milliput, etc.) would allow you to sculpt the surface smooth and be done with it - no second application or sanding necessary. If you want a cheaper option (you probably have the materials handy), coat the line in CA (super)glue and sprinkle baking soda over it, then file down the hardened filler (this method may be a bit crude for grooves this tiny, though - works well on vehicle panel lines, at least). If you have styrene cement handy, you can even fill it in with liquified plastic, then file/sand it smooth.
Liquid or solid putty is likely your easiest option - exactly which is a matter of personal preference and what you have handy.
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