Applying antifoulant

[landonshaw]

Sanded half of the hull today, the other half tomorrow.

Another issue. There are a few blisters on the hull, what is the best way to fix? Seven years ago I think I opened a few up then filled with an epoxy and painted over with a sealer before the antifoulant paint.

What is the proper procedure and possible products to use?

[landonshaw]

Here is a great you tube for the question I asked.

https://m.youtube.com/watch?v=DZzhDIoy5RY

[tkeithlu]

Let's simplify this very complex conversation. The goal is to remove them. Barnacles and oyster shells are basically calcium carbonate. As such, they will react with acids, ergo dissolve. Hydrochloric/muriatic acid is the active ingredient in bunches of household and construction liquids, such as shower stall grout/calcium carbonate (the white stains) cleaners. Bleach, on the other hand, is a base and won't work. Purchase by the active ingredients, because they jack the price up for the label that says it's for yachts.....

I had not thought of cleaning a prop with it, and will do that on the next haul out.

Go for it, just, as clearly stated by a64pilot above, be careful out there.

[landonshaw]

Muriatic acid will definitely remove barnacles. It will also remove the antifoulant on the hull. Does anyone know what it is doing to the barrier paint?

[Compass790]

Just my experience YMMV,
To renew antifoul we just sand smooth & dont worry about stuck on barnacle & oyster bits except when we are hauled out want to renew barrier coat. For decades we've done it on a tidal grid but that may not be possible any more. When we have hauled out & removed everything it hasn't made any noticeable difference to the life of the antifoul.
Mostly we use the ablative type so not much hard type antifoul experience

[landonshaw]

Thank you. How often did you use the tide method, yearly, every two years?

[Compass790]

Originally Posted by landonshaw

Thank you. How often did you use the tide method, yearly, every two years?

Every 2 years but we are in an estuary with brackish water. If you are moored in the sea proper here you would need to do it annually, at least since TBT paints were banned