Decal Softener Calculator — Soak Time & Softener Volume for Waterslide Decals

No decal-softener manufacturer publishes a dose-per-area figure — Microscale, Vallejo, Gunze and Green Stuff World all say the same thing: brush on a thin coat "as needed" and repeat until the carrier film lies flat. The proper measure is coats, not millilitres. This calculator's main job is to tell you how many softener coats and how much soak/setting time a given job needs; the ml figure is only a rough planning heuristic so you can judge whether your bottle will last the project.

How the planning estimate works

The volume is a heuristic, not a product spec. It starts from a nominal 0.15 ml per 100 cm² of decal area per coat (a typical thin brushed-on film), then scales it for surface geometry, film thickness and the number of decals:

• Surface modifier — flat 1.0; curved 1.4; recessed 1.8; compound curves 2.2, since wrinkled film over deep detail soaks up more softener over more passes
• Thickness modifier — thin films 0.7, standard kit decals 1.0, thick/older films 1.5, as heavier carrier films need more chemical action and a longer soak
• Absorption rate — nudge above 1.0 for porous or matt surfaces that wick the softener away before it can act on the film
• Coats — flat surfaces usually settle in 1 coat; curves take 2; recessed and compound detail typically need 3, applied wet-on-dry until the wrinkles vanish

Treat the millilitre output as "enough to cover the job with a little to spare", not an exact requirement. A 1 oz (≈30 ml) bottle of Micro Sol covers hundreds of decals. Soak time is derived from film thickness, and the application method is matched to the surface complexity.