Tercoo on cast iron keel - disappointment
Hello everyone, I was deceived by the Tercoo hype. Buyers, beware!
The advertising claims that Tercoo is suitable for ALL metals to remove ALL coatings and corrosion. It is also claimed (SVB catalog 2023, p.334 and online) that the 1-pane version can cover 4-6sqm per hour and the service life is 90-120sqm. The advertising claims the performance is as good as sandblasting - sandblasting without sand.
You should first divide these given numbers by ten to get to the actual numbers. I believe this is a misprint by SVB as the Tercoo manual claims the service life is a maximum of 10sqm.
The other claims are marketing nonsense!
I used the 2 disk version with my AC drill. I used them to remove antifouling, epoxy and corrosion from my cast iron keel (approximately 4sqm, daggerboard keel). I wanted to get the metal to a clean surface to recoat the keel with epoxy.
- It took at least three hours to clean just 1sqm. The work is VERY slow and tedious!
- After I cleaned about 2 square meters, the part was badly damaged and could no longer be used.
- Dust and dirt flew everywhere, even worse than an angle grinder! Using a drill often directs dirt directly into your face. You MUST wear full eye and face protection. Afterwards, my torso was covered with an oily layer of iron oxide.
- The surface has not been sandblasted in any way. That's just nonsense. It's good, but it can't be compared to sandblasting. My angle grinder with a few different attachments completed the rest of the area much quicker and to the same standard.
In the fine print of the manual (aha!), Tercoo says that you should not use this tool on heavily weathered surfaces as you will damage the tool. Additionally, you can only use the tool on flat surfaces; curved surfaces will also damage the tool.
Well, great - cast iron is a very rough surface from the casting process, and my keel has a convex flange and a torpedo-like bulb - so the tool wore out very quickly. They don't tell you that in the marketing materials!
In my opinion it is NOT a good tool for a cast iron keel!
Most likely, this tool is suitable for flat steel or concrete surfaces with only a thin coating.
Even for these surfaces, I think only the 3-disc version works fast enough to be worth the money. (This is a very expensive tool). And you will definitely need the "Triple Dust Extractor" accessory to remove the large amount of dust that is generated.
If you have cast iron keel, it's better to pay the professionals for sandblasting!
And if you insist on doing it yourself, use an angle grinder with the right attachments to save yourself a lot of time and hassle!