Polyurea

Yes, you can measure with ultrasound through a coating. Ideally you calibrate the tester with a sample of coated steel.

 

I just forget add word : range.

 

@Lisbeth what kind of vessel is it ?

 

Where is your data coming from? Sore A30 is a rubber eraser.

 

There is lot of different chemistry , different apllying processes , different conditions under polyurea meaning . Every company have own brand names it's time consuming digging but in this case I think is worth the effort.

 

It was all the rage 15 to 20 years ago up here. We did all our inner bulwarks with it, held up good in all the non high wear areas but flaked off where a lof of gear connects with the back rail. All coatings do, so not necessarily a fault of the coating the only long term solution has been cladding with uhmw sheet. It was a bugger to grind off the areas it didnt flake off.

My only fault at the time was the sales pitch that the colors were uv stable, seems like the black was mostly stable but the Grey we used went lighter amd chalky in a year or two. Sold the boat when the coating was about 12 years old so dont have a long term review.

At the time guys were doing the hauling side of their boats in close color match polyurea to hull color. After a couple years the uv stability was very apparent with much faster rates of fade.

One little crab boat had whole sheets start picking off and the dock scuttle was that it had gone over primer and not adhered properly. But the boats that had it shot onto bare blasted steel also met a similar fate in high wear areas. Keep in mind these problems arose from single point impacts that broke down the coating over time.

Still see it in fish hold coatings, but its regarded as not as good as an frp coated hold.

While we didnt have below the waterline coated, the high water flow areas still grew marine growth. Its surface profile and chemical composition didnt keep growth off any better than normal paint.


Last week I spent the whole time prepping the wife's adventure vehicle for a polyrurea coating. It was a combination of glass and aluminum so they wanted a 2k type primer for the glass and a specific etching primer for the aluminum. It looks nice, they shot it on a smooth as they could as we were trying a metal flake tint that usually gets buried in the matrix. Time will tell how it holds up but so far it looks good one week in. Still think the surface profile is more than Id like to start with below the waterline.

Cost wise its gotta be up there with other premium finish coats, stuff we shot was expensive but im told the normal colors are around the same as other finish systems.