Under-order and you're stuck mixing a second batch mid-lay-up, trying to match a join in cloth that's already going off. Over-order and you've spent money on resin that sits on a shelf. Getting the quantity right up front comes down to knowing how your project's numbers actually translate into litres, and it varies more between products than people expect.
Coverage Isn't the Same Across Every Product
Some of our resins publish exact coverage figures because the job is a known, fixed depth. MAS Table Top Pro Epoxy is a good example: a 10-litre kit covers approximately 2.94m² at a flood coat depth of around 3.1mm, a 4-litre kit covers roughly 1.179m² at the same depth, and a 2-litre kit covers about 0.58m². Because a table top pour is a known, fixed depth, the maths scales cleanly — measure your surface area, decide your depth, and the kit size follows directly.
Laminating and coating work doesn't scale as cleanly, because coverage depends on how many layers of cloth you're wetting out, how porous the substrate is, and how heavy a hand you use with the roller. As a starting point for planning rather than a fixed number, it's sensible to over-estimate a laminating job by a reasonable margin on your first attempt at a given layup, then use what you actually used to plan future, similar jobs more precisely.
When in Doubt, Ask Before You Order
Rather than guessing on a job you haven't done before, it's worth getting a second opinion before you place an order rather than after you've already run short. Our workshop team can talk you through a sensible quantity for your specific project, and our full epoxy resin range is worth browsing to compare kit sizes across products before you commit to an order.
Getting the Mix Ratio Right, Not Just the Total Volume
Once you know your total quantity, remember that the ratio matters just as much as the volume — a 2:1 resin like MAS Low Vis or MAS FLAG needs twice as much resin as hardener by volume, while a 5:1 system like MAS Boat Building Epoxy 5:1 needs five parts resin to one part hardener. Getting this wrong doesn't just waste material, it can leave you with an epoxy that never cures properly, so measure by volume carefully rather than eyeballing it, especially on a larger batch where a small error compounds into a real problem.
Buy for the Job, Not Just the Minimum
Once you've worked out a sensible total, it's worth rounding up rather than ordering the bare minimum, particularly for a job you can't easily pause partway through, like a laminating session or a casting pour. Running short mid-job is far more disruptive than having a little extra resin left over for the next repair.
If you're planning a specific project and want a second opinion on quantity before you order, our contact page is the quickest way to reach the workshop team.
