Hacker News Reader

Some epoxy manufacturers make it pretty easy. For example, West System sells special hand pumps[1] for their resin and hardener, which attach directly to the product's cans and provide the right ratio for you--just use the same number of pumps from each product and you're good. Maybe a lot of manufacturers offer their own ratio pumps--I'm only really familiar with West.

1: https://www.westsystem.com/the-105-system/metering-pumps/300...

View on HN

Those pumps are awful. If you get an air bubble in the line or need a small amount you risk messing up the ratio and having a poorly cured batch. Plus the hardeners react with the air so if its been sitting a little while the first part of your pump is bad hardener. Highly recommend everyone use a scale.

That's a good point. I've found the pumps to be handy for West System especially the 1:5 (or whatever odd ratios they have) but don't like how they are messy and tough to transport. Have had the hand pumps get pressed in the back of the truck and stuff and it can be a nuisance - but they can also be quite convenient when working as intended.

Reply on news.ycombinator.com