WFT ↔ DFT calculator, with thinner

Type a dry film thickness to get the wet film to apply, or a wet-film comb reading to get the dry film it will leave.

This tool is a reference aid. Before you act on a result, check it against your specification and the product data sheet.

How it works

Volume solids is the share of the wet film that stays after the solvent evaporates. Thinner adds volume but no solids, so it lowers the volume solids as applied: VS as applied = VS × 100 ÷ (100 + thinner %).

Worked example

Specification 150 µm DFT, paint with 55 % volume solids, thinned 5 %. VS as applied = 55 × 100 ÷ 105 = 52.4 %. WFT = 150 ÷ 0.524 = 286 µm. Forget the thinner and you get 273 µm; multiply instead of divide and you get 79 µm.

Limits

• Read the comb straight after application, before solvent loss; on a curved surface, along the axis.
• The formula plans the wet film. Acceptance is decided by the DFT measured on the cured film.
• Switching between µm and mils converts the thicknesses already typed.

Related: WFT ↔ DFT guide · Paint consumption calculator · Concept: volume solids.