# Crown Trade Fastflow Quick Dry Primer Undercoat

Primer, undercoat and sealer · Crown Trade

Crown Trade Fastflow Quick Dry Primer Undercoat covers up to 15 m² a litre and takes 1 coat, by Crown Trade's own figures.
Source: Crown Trade, Crown Trade Fastflow Quick Dry Primer Undercoat data sheet (dated November 2021), read 11 October 2026.

What it is for, in the maker's words: “Substrates Doors / Windows / Exterior Wood / Interior Wood / Metal / PVCu” (Crown Trade Fastflow Quick Dry Primer Undercoat product page, read 11 October 2026).

## Coverage

Crown Trade states up to 15 m² a litre. The maker's words: “Up to 15m² per litre on smooth surfaces but may reduce depending on surface texture and porosity”.
- Bare, rough or absorbent surfaces: A maker's coverage is their best case, on a smooth sealed surface: bare, rough or absorbent surfaces take more. Crown Trade's own words: “Up to 15m² per litre on smooth surfaces but may reduce depending on surface texture and porosity”.
- Waste and touch-ups: The tin-by-tin figures add nothing for what stays in the tray and on the brush, or for touching up.

## Coats

Crown Trade gives 1 coat for Crown Trade Fastflow Quick Dry Primer Undercoat, in these words: “Apply one coat as required”.

## Tin sizes

| Tin | One coat |
|---|---|
| 1 L | up to 15 m² |
| 2.5 L | up to 37.5 m² |
| 5 L | up to 75 m² |

Arithmetic on the maker's figure: the litres in the tin times the coverage per litre, with nothing added for waste.

## Where to buy it

The page has the shops' own searches for it, and any link there that is paid for is marked Ad: https://buildbatch.co.uk/products/crown-trade-fastflow-quick-dry-primer-undercoat/#where-to-buy. BuildBatch sells nothing and compares no prices.

## Questions

**How much does a litre of Crown Trade Fastflow Quick Dry Primer Undercoat cover?** Crown Trade states up to 15 m² a litre for Crown Trade Fastflow Quick Dry Primer Undercoat (Crown Trade Fastflow Quick Dry Primer Undercoat data sheet (dated November 2021), read 11 October 2026). A maker's coverage is their best case, on a smooth sealed surface.

**How much does a 5 litre tin of Crown Trade Fastflow Quick Dry Primer Undercoat cover?** At the maker's figure a 5 L tin covers up to 75 m² in one coat. That is the litres times the coverage per litre, with nothing added for waste.

**How many coats does Crown Trade Fastflow Quick Dry Primer Undercoat need?** Crown Trade gives 1 coat for Crown Trade Fastflow Quick Dry Primer Undercoat, in these words: “Apply one coat as required”.

**What is Crown Trade Fastflow Quick Dry Primer Undercoat for?** Crown Trade says: “Substrates Doors / Windows / Exterior Wood / Interior Wood / Metal / PVCu” (Crown Trade Fastflow Quick Dry Primer Undercoat product page, read 11 October 2026).

**What tin sizes does Crown Trade Fastflow Quick Dry Primer Undercoat come in?** The catalogue lists 1 L, 2.5 L and 5 L. A shop may not stock every size.

## Where the figures come from

- Crown Trade, Crown Trade Fastflow Quick Dry Primer Undercoat data sheet (dated November 2021) (https://professional.crownpaints.com//content/uploads/product-sync-resources/qrJLQXGYse8FFWbo.pdf): coverage and coats, read 11 October 2026.
- Crown Trade, Crown Trade Fastflow Quick Dry Primer Undercoat product page (https://professional.crownpaints.com/product/crown-trade-fastflow-quick-dry-primer-undercoat/): what it is for, read 11 October 2026.

Written with AI tools; not yet checked by a tradesperson. Follow the tin's own instructions.

The page: https://buildbatch.co.uk/products/crown-trade-fastflow-quick-dry-primer-undercoat/