# Best Gap Filling Putty for Miniatures and Models Source: https://minipaintlab.com/best/best-gap-filling-putty Updated: 2026-10-02 Publisher: Mini Paint Lab. Our score is an editorial rating out of 10 (fit 35%, features 25%, build 20%, value 20%), not a customer rating. Method: https://minipaintlab.com/how-we-research#our-score Every multi-part kit has seams, and primer makes them more visible, not less. Gap filling is the unglamorous step between assembly and priming that separates clean models from obviously glued-together ones. The right filler depends on the gap. Liquid putties flow into hairline seams and sand smooth, epoxy putties bridge the large joins on resin and metal models, sprue goo melts into polystyrene joints and sands like the surrounding plastic, and thick CA glue with accelerator fills and cures in seconds. This guide compares the most effective gap fillers across all these categories, judged on shrinkage, sanding behavior, working time, and how well each one preserves nearby detail when you clean up the excess. ## Picks ### 1. The Army Painter Green Stuff Kneadatite 20cm - 2-Part Epoxy Modelling Putty for Miniatures Our score: 8.1/10 (Fit for the job 9/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10) The Army Painter Green Stuff Kneadatite in a 20cm strip, a 2-part epoxy modelling putty for miniature sculpting. Pros: - Classic Kneadatite formula is the standard for mini conversions - Blue and yellow strip mixes to a tough green sculpting putty - 20cm length covers plenty of fur, cloaks and gap fills Cons: - Sticky when fresh, so tools need water or lubricant - Cut ends of the strip can start curing where colors touch Details: https://minipaintlab.com/product/B001AE5ZQO ### 2. Milliput Superfine Grain Epoxy Putty, 2-Part Self Hardening White, 4 oz. Our score: 8.1/10 (Fit for the job 9/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10) Milliput Superfine Grain epoxy putty in white, a 2-part self hardening 4 oz putty for smooth gap filling and sculpting. Pros: - Superfine grain gives a smooth finish for visible seams - White color makes it easy to see coverage under primer - Hardens to a sandable, carvable surface for fine repairs Cons: - Softer working time can make sharp details slump - Slightly pricier than the standard grain version Details: https://minipaintlab.com/product/B002CNEWAM ### 3. Milliput Standard Grain Epoxy Putty, 2-Part Self Hardening Yellow-Grey, 4 oz. Our score: 8.0/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 9/10) Milliput Standard Grain epoxy putty, a 2-part self hardening yellow-grey putty in 4 oz for filling gaps and repairs. Pros: - 2-part epoxy hardens rock solid and can be sanded or drilled - Water-smoothable, so gap edges blend neatly before curing - 4 oz pack lasts through many models and repairs Cons: - Standard grain is coarser than superfine for tiny detail - Mixing equal parts takes care to get a proper cure Details: https://minipaintlab.com/product/B001OBBTMW ### 4. Milliput Superfine White Epoxy Putty 2 Pack - Porcelain Repair Kit Our score: 7.8/10 (Fit for the job 8/10 · Features and specs 8/10 · Build and materials 8/10 · Value 7/10) A 2 pack of Milliput Superfine White two-part epoxy putty, two 4 oz packs (8 oz in total) with gloves, for gap filling, repairs and smooth sculpted detail. Pros: - Superfine White is the smoothest Milliput grade, suited to fine gap filling and detail - Two 4 oz packs give plenty of putty for a large army or several conversion projects - Two pairs of latex-free gloves are included for mixing the two parts Cons: - Sold as a household repair bundle, so the pack is larger than most painters need at once - Two-part epoxy has to be kneaded together and cures slowly compared with acrylic fillers Details: https://minipaintlab.com/product/B0BL1HLMFR ### 5. Green Stuff World MAXX Putty (300gr) Our score: 7.8/10 (Fit for the job 8/10 · Features and specs 8/10 · Build and materials 8/10 · Value 7/10) Green Stuff World MAXX Putty is a two-part epoxy putty in a 300 g pack. Mixed 1:1 it gives a clay-like beige putty with about 90 to 120 minutes of working time for sculpting and filling. Pros: - Around 90 to 120 minutes of working time leaves room to shape details or press putty into gaps without rushing - Cures at room temperature to a rock-hard finish (Shore D 80) that can be sanded, drilled and painted - Smooths with water or alcohol on wet fingers or gloves, and 300 g goes a long way on conversions and bases Cons: - A larger and pricier pack than a strip of classic green stuff, more than you need for a few small gap fills - Full hardness takes about 24 hours, and it mixes to beige instead of the familiar green of Kneadatite Details: https://minipaintlab.com/product/B0B2KMW8BL ### 6. Tamiya Epoxy Sculpting Putty Our score: 7.3/10 (Fit for the job 8/10 · Features and specs 6/10 · Build and materials 8/10 · Value 7/10) Tamiya Epoxy Sculpting Putty, a smooth two-part putty for sculpting details and filling gaps on scale models. Pros: - Smooth texture blends well for seams and sculpted details - Tamiya consistency makes results predictable across batches - Sands and carves cleanly after curing, so seams blend in Cons: - Check the pack amount before ordering enough putty - Longer cure time than quick-set fillers, which slows painting Details: https://minipaintlab.com/product/B000BMTGX4 ### 7. Green Stuff World - Green Putty 2241 for Models and Miniatures Our score: 7.2/10 (Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) Green Stuff World Green Putty (ref 2241), a water-based acrylic filler with an extra fine grain that dries fast and hard for filling seams on miniatures. Pros: - Extra fine-grained filler made specifically for models and miniatures - Listed as not shrinking when it dries, so seams usually need one application - Water-based, with good adhesion and easy sanding once hard Cons: - An acrylic filler, not two-part epoxy putty, so it is for filling gaps and not for sculpting - Fast drying leaves a short working time on larger gaps Details: https://minipaintlab.com/product/B0872WMD7P As an Amazon Associate I earn from qualifying purchases.