Paint sealer for antifouling paint
the paint sealers in Biltema’s range can be used both before you paint the boat hull and when you need to paint on top of existing antifouling paint.
Our paint sealers are suitable as sealers/sealing coats for existing antifouling paints on fibreglass, metal and wooden hulls. They can also be used as a primer before applying new antifouling paint to wood and metal.
Why we recommend the use of primer
It is highly recommended to use primer when painting your boat. The primer prepares the surface for painting (and for the finishing). There are many advantages to using primer, some of which we describe now.
If you use primer for boat painting, you can expect a better result, and that in itself is reason enough to use it. However, you will also find that it is typically easier and faster to paint the boat if primer is applied first.
Applying primer
To apply primer, you will need some tools. Typically, primer can be applied with a roller, sprayer or brush. If you want to use a sprayer, it may be necessary to use a diluting product. As you may have noticed, we sell this too. See the instructions on how to use the individual products when you click on your desired product. It couldn’t be easier.
On the individual product pages, you can also learn more about the content and coverage of the primers (coverage is typically stated in square metres). Before using primer, you should familiarise yourself with how much to apply, and it is good to know the drying time. Only when the primer is completely dry can you start the actual painting work.
Also remember to check whether the boat primer is suitable for use above and/or below the waterline.
How to apply Biltema’s paint sealer/primer
Sealer/insulation coat for existing antifouling paint on fibereglass, wood and metal hulls. Can be painted on top of most types of antifouling paint.
- Our sealers have good adhesion to old antifouling paint.
- Primer for wooden and metal hulls before applying antifouling paint.
- Must always be painted over with antifouling paint.
Specifications:
- Coverage: 9 m2/litre – 40 micrometres
- Application: Roller or brush
- Dilution: Biltema thinner (36-1612)
- Drying time: 3-4 hours at 20 °C, 6-8 hours at 10 °C.
- Next coat: 4 hours at 20 °C, 8 hours at 10 °C.
Surface pre-treatment:
On existing paint: Make sure the surface is dry and free of oil and loose antifouling paint. Clean and degrease with paint cleaner. Clean with clean water. Allow to dry.
On wood: Make sure the surface is dry and clean and saturated with oil. Sand lightly and clean with solvent. Allow to dry.
Application: When applying, the surface temperature must be at least 5 °C. Do not paint in bright sunshine, on hot surfaces, or in humid conditions.
- On existing paint: First apply on a smaller surface and allow to dry. Then apply 1-2 coats.
- On wood: For the first coat, dilute with 20% thinner so that the sealer penetrates properly. Then apply 3 more coats.
How to paint with primer for alkyd paint:
Our primer for alkyd paint is quick-drying and can be used on steel, wood and fibreglass. It will act as an undercoat/primer for the alkyd paint.
How to use alkyd primer:
- The surface to be painted must be dry and free of dirt and grease.
- Sand with fine sandpaper P240-320.
- The air temperature must be at least + 5 °C.
- Do not apply the primer in bright sunshine, on hot surfaces or in humid conditions.
- Ensure adequate ventilation.
- Stir the paint/primer before applying.
- Apply two coats with a brush, roller or sprayer. (If necessary, add a maximum of 10% thinner)
- Allow the paint to dry for 18 hours between each coat.
- Cleaning and dilution: Use Thinner No. 1.
- Dust-dry: 2-4 hours.
- Next coat: 18-36 hours.
- Fully dry: 72 hours.
Application with paint sprayer:
- Dilution: 15-25%
- Nozzle: 1.3-1.4 mm.
- Operating pressure: 2-3 bar.
If you need to know more about the content and use of protective equipment for our primers, read the safety data sheet for the desired product.
