What is Reddit's opinion of AK-Interactive Silicone Brushes Hard Tip, Small - 5Pk - Model Building Paints and Tools # AK-9087?
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If you use acrylics, you can “scrape” the edges to make them cleaner. When there is an undercoat of acrylic this is tricky to avoid damaging the undercoat. Toothpicks are the usual choice for this but what you are talking about is either a silicone brush or sculpting tool and I guess could be more gentle than a toothpick.

Silicone brushes example: AK Interactive Silicone Brushes Hard Tip, Small - 5Pk - Plastic Model Tools & Accessories, Item # 9087 https://www.amazon.com/dp/B08WTXVTDJ/ref=cm_sw_r_cp_api_glt_fabc_T6R4GYS2JNF95WPK1NEP

Sculpting tool example: 3Pcs/Set Clay Sculpting Tools, Double Head Silicon Rubber Tip Clay Color Shapers, Elegant Wood Handle Modeling Pen for Nail Art,Sculpture,Carving,Pottery,Blending,Drawing https://www.amazon.com/dp/B07Y6FW33P/ref=cm_sw_r_cp_api_glt_fabc_ZVEABPBRAC3QX7ZWCQQF