Categories Interesting about yachts

What Are Blisters On A Motor Yacht?

Hull blistering is a fairly common sight in boatyards and, as its name implies, consists of small, unsightly bumps on the boat’s hull below the waterline. However problems occur because that glycol has nowhere to go after the hull is cured and when the boat has already been launched.

What causes boat blisters and how to prevent them?

  • Different parts of a boat can experience different issues from excess water – metal on the boat will corrode while the gel coat will develop boat blisters. Let’s dive in and look at what causes this blistering and how to prevent it. A primary cause of hull blisters is the long-term immersion of the hull in water.

What causes blisters on boats?

Fiberglass blisters occur because water passes through the gelcoat. Water soluble chemicals inside the laminate exert an osmotic pull on water outside, and some water molecules find a way through the gelcoat. As more water is attracted into the enclosed space, internal pressure builds.

How bad are blisters on a boat?

Left untreated, accumulation of a large number of blisters will eventually create a serious hull delamination. The degree of structural damage will increase as the blisters fracture and penetrate deeper into the layers of the hull. Osmosis comes not only from water on the outside of the hull.

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How do you prevent hull blisters?

How to prevent the blisters on the boat hull? Applying good quality gel coat (epoxy resin to resist water well than polyester resin) and a barrier coat over a gel coat (to give more protection) will prevent blisters on a boat hull to some extent.

What causes blistering on gelcoat?

Gelcoat blisters, also called osmotic blisters, The Pox, and chicken pox, are those unsightly bumps on the surface of a fiberglass/gelcoat hull. Blisters are caused when water permeates the gelcoat layer and accumulates in voids beneath it. If left unchecked, water can eventually permeate the fiberglass laminate.

How do you fix gelcoat blisters on a boat?

Gelcoat Blister Repair

  1. Don’t let a few blisters on your hull intimidate you this spring! (
  2. Figure 1: Break open each blister.
  3. Figure 2: Grind away the broken dome of the blister.
  4. Figure 3: Scrub until squeaky clean with a stiff brush.
  5. Figure 4: Paint the inside of each cavity with epoxy resin.

How do you get bubbles out of fiberglass?

Air bubbles trapped in fiberglass must be repaired.

  1. Expose the bubble.
  2. Wash the opened bubble with acetone and allow it to dry.
  3. Mix a small batch of Gelcoat with its catalyst in a paper cup.
  4. Pull the plunger off a plastic syringe and fill the chamber with Gelcoat.

What is Pox boat?

Sometimes just called boat pox, you’ll find these when you pull a boat from the water. These can get serious and appear as numerous blisters. A fresh coat of bottom paint is not always a solution.

What causes osmotic blistering?

Osmotic blisters can form as a result of water-soluble salt contamination on the surface of the steel being coated or water-soluble solvents that are retained or “trapped” within an applied coating layer. When these pressures exceed the coating’s adhesive bond to the substrate, a blister forms.

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How do I know if my boat has osmosis?

A professional boat surveyor will recognise the early signs of boat osmosis. 2. A blister that is considered Osmosis is typically a result of moisture being trapped within the fiberglass below the gelcoat and or top coatings causing softening in those areas.

How do you fix a blister?


  1. Wash your hands and the blister with soap and warm water.
  2. Swab the blister with iodine.
  3. Sterilize a clean, sharp needle by wiping it with rubbing alcohol.
  4. Use the needle to puncture the blister.
  5. Apply an ointment such as petroleum jelly to the blister and cover it with a nonstick gauze bandage.

How do you fix osmosis blisters?

Preparation to Cure Osmosis Blistering

  1. 1 – Grind out or Sandblast all blisters down to sound laminate. Get under all of the loose material.
  2. 3 – Dry the Hull. Whilst drying the hull will not be necessary if there is no damage, in most cases it will be required to dry the hull.
  3. 4 – Check the Hull is Dry.

How do you take care of a blister?

To treat a blister, dermatologists recommend the following:

  1. Cover the blister. Loosely cover the blister with a bandage.
  2. Use padding. To protect blisters in pressure areas, such as the bottom of your feet, use padding.
  3. Avoid popping or draining a blister, as this could lead to infection.
  4. Keep the area clean and covered.
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