Crown Trade Fastflow Quick Dry Primer Undercoat

Crown Trade Fastflow Quick Dry Primer Undercoat can be used when decorating new woodwork or refreshing previously painted surfaces. It provides a base for the decorative finish, while also allowing bare patches to be spot primed during preparation. On metal, a suitable metal primer is required on exposed areas before undercoating.

Suitability

Suitable for doors, window frames, skirting boards and other interior and exterior woodwork, together with appropriately prepared and primed metal surfaces.

Complete your project with a topcoat from the Crown Trade Fastflow Quick Dry range, choosing the finish to suit your project:

Product Use Crown Trade Fastflow Quick Dry Gloss A water-based gloss paint for prepared interior and exterior wood and metal where a high sheen finish is preferred. Crown Trade Fastflow Quick Dry Satin A quick drying satin paint for interior and exterior wood and metal, offering a higher sheen than eggshell. Crown Trade Fastflow Quick Dry Eggshell A water-based eggshell paint for prepared interior and exterior wood and metal where a low sheen finish is preferred.

Surfaces to be painted must be sound, clean, dry and free from dirt, dust, grease and anything that could affect adhesion.

Please note: Take special precautions when preparing pre-1960s painted surfaces, as they may contain harmful levels of lead. Avoid inhaling dust during preparation and wear suitable respiratory protection.

1. Remove loose and failing paint, feathering the edges of the remaining sound coating.
2. Treat mould, algae and other organic growth with a suitable fungicidal wash, such a Sandtex Fungicidal Wash, following the manufacturer's instructions, and remove the growth.
3. Fill holes, cracks and shallow defects with a suitable Wood Filler. Once set, smooth the repairs and remove all dust.
4. Wash previously painted surfaces with a warm water and liquid detergent solution, changing the water regularly.
5. Wet abrade sound painted wood and glossy or eggshell metal coatings to provide a key. Rinse with clean water to remove residues and allow to dry.

Additional Preparation for Wood

1. Remove any grey, weathered wood by sanding back to a sound surface.
2. Clean exposed timber containing oils or extractives with methylated spirits, frequently changing the face of the cloth.
3. Treat exposed knots with two thin coats of fresh Colron Knotting Solution.
4. On new wood, fill fixing holes, open joints and shallow defects with a suitable
5. Fill holes, cracks and shallow defects with a suitable Wood Filler. Once set, sand smooth and remove all dust.

Crown Trade Fastflow Quick Dry Primer Undercoat can be applied directly to prepared bare wood; a separate wood primer is not required. Spot prime exposed areas on previously decorated wood with this product before undercoating overall.

Additional Preparation for Metal

1. On new metal, excluding galvanised surfaces, lightly abrade to a bright, but not polished, surface. Remove all residues and apply a suitable metal primer.
2. On bright galvanised metal, degrease thoroughly and pre-treat with a suitable T wash, following the manufacturer's instructions. Overall blackening indicates successful treatment. Allow to dry, then apply a suitable metal primer.
3. Prime bare non-ferrous metal with a suitable metal primer before applying Crown Trade Fastflow Quick Dry Primer Undercoat.
4. On ferrous metal, remove rust and millscale back to clean, bright metal. Remove all residues and apply a suitable metal primer within the same working day.
5. On previously decorated metal, remove corrosion back to clean, bright metal and spot prime exposed areas with a suitable metal primer. Allow to dry before undercoating.

Always carry out a test application to check suitability and compatibility with the prepared surface. Follow the manufacturer's instructions on the container.

Do not apply if air or surface temperatures are likely to fall below 8°C, or if relative humidity exceeds 80%, during application or drying.

1. Stir thoroughly before and during use.
2. Apply using a suitable synthetic brush, short or medium pile roller, or airless spray equipment. For airless spraying, dilution may be required; follow the spray equipment manufacturer's guidelines.
3. Spot prime exposed wood where required, allowing it to dry before undercoating overall.
4. Apply one coat of Crown Trade Fastflow Quick Dry Primer Undercoat as required. Maintain a wet edge and, on wood, lay off in the direction of the grain.
5. Allow at least 4 hours before recoating, ensuring the previous coat is fully dry. Touch dry in 1-2 hours at 20°C and 65% relative humidity; colder or more humid conditions will extend drying times.
6. Avoid excessive sanding between coats. Leave newly painted doors and windows open until the paint is fully dry.

Clean brushes and equipment immediately after use with clean water or warm soapy water, then rinse thoroughly.

Do I need a separate primer before using Crown Trade Fastflow Quick Dry Primer Undercoat?

On prepared bare wood, no separate wood primer is required. Bare metal needs a suitable metal primer before applying this product. Previously painted surfaces must be sound and correctly prepared, with exposed areas spot primed as appropriate.

Can I use it over existing paint?

Yes, provided the existing coating is sound, clean and properly prepared. Remove failing paint, feather the edges and prepare the remaining coating as described in the Preparation section. Carry out a test application to check compatibility before proceeding.

Is it suitable for exterior woodwork?

Yes, it can be used on suitably prepared exterior woodwork, including doors and window frames. It must be finished with a suitable decorative topcoat; it is not intended to be left as the final finish.

Will it stop knots from staining through the paint?

Knots require separate treatment before painting. Crown specifies two coats of fresh knotting solution during preparation; Fastflow Quick Dry Primer Undercoat does not replace this treatment.

How many coats do I need?

Crown recommends one coat as required, with bare patches on previously painted wood spot primed before undercoating overall. Bare metal requires a suitable metal primer first. Complete the system with your chosen Fastflow topcoat, following its application instructions.

How soon can I apply the topcoat?

Allow at least 4 hours at 20°C and 65% relative humidity, ensuring the primer undercoat is fully dry before overcoating. It is touch dry in 1-2 hours, but this does not mean it is ready for the next coat. Cold or humid conditions can extend drying times.

Which paints can I use over this primer undercoat?

It is designed for use with Crown Trade Fastflow Quick Dry Gloss, Satin and Eggshell. Choose the topcoat according to the sheen required and follow the instructions for that product.

Can I spray Crown Trade Fastflow Quick Dry Primer Undercoat?

Yes, Crown's technical data sheet allows airless spray application. Dilution may be required; follow the spray equipment manufacturer's guidelines. It can also be applied with a synthetic brush or a short or medium pile roller.