

🧱 Build it right, fill it tight—West System’s secret to flawless fixes!
West System 40445 High Density Filler is a 43-ounce epoxy additive designed to thicken mixtures and fill gaps with professional-grade density. Ideal for automotive and specialty repairs, it delivers a smooth, durable finish trusted by pros and backed by excellent customer reviews.



















| ASIN | B0006JJAU6 |
| Batteries Required? | No |
| Best Sellers Rank | #204,429 in Automotive ( See Top 100 in Automotive ) #485 in Automotive Fillers, Adhesives & Sealants |
| Color | off-white |
| Customer Reviews | 4.7 4.7 out of 5 stars (95) |
| Date First Available | 30 October 2013 |
| Item model number | 404-45 |
| Material Type(s) | epoxy; filler |
| Number of Puzzle Pieces | 1 |
| Product Dimensions | 53.98 x 40.64 x 29.21 cm; 1.5 kg |
B**I
Nice addition to west epoxy, thickens mixture and fills gaps, just as advertised.
G**S
Works has West System had said
R**U
west system is great products
K**A
I use West System products exclusively when doing marine fiberglass repairs/modifications. There are many different filler options, so choose the one that best fits your needs. Mix the resin, add the filler and mix to your desired consistency, then apply. For me, usually similar to mayonnaise works best. Drying time will depend on your choice of hardener and if you've adjusted the resin/hardener ratio.
I**G
Must have for epoxy work, mixes well without clumps
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