Which relationship does the manufacturer calculator show?
Jotun's technical calculator shows dry film thickness = wet film thickness x volume solids percentage / 100. Its interface labels the thickness input and output in micrometers. This relationship requires the applicable volume-solids basis; it does not turn a wet-film observation into a measured dry-film inspection.
Genset Enclosures is independent and is not affiliated with Jotun. The worked values below are synthetic and do not specify a coating product, protection system, corrosion category or fire rating.
Sources: Jotun: Technical Calculator, Dry Film Thickness formula
What should the enclosure coating register preserve?
Use the actual approved coating specification, current product data and application instructions. Keep separate coats and the specified total system thickness identifiable. Record the approved treatment of any thinning rather than assume that a label value describes an altered mixture.
| Field | Evidence | Review action |
|---|---|---|
| Surface and coat | Enclosure face, coat identity and approved system | Do not mix primer and total-system targets |
| Specified thickness | Wet or dry, unit and acceptance reference | Preserve the stated quantity |
| Product basis | Exact product data and applicable volume solids | Do not substitute solids by mass |
| Application record | Actual wet-film observation and location | Keep it distinct from a prediction |
| Dry inspection | Actual result, location and approved method | Use the project acceptance process |
| Disposition | Coating reviewer and correction reference | Retain both original and later records |
What does a 200-micrometer wet film predict in the example?
Illustrative example. An invented coating case has 200 micrometers wet film and 60 percent applicable volume solids. The calculator relationship gives 200 x 60 / 100 = 120 micrometers predicted dry film. The wet and predicted dry values differ despite describing the same example coat.
A drawing note requiring 200 micrometers dry film would therefore not be satisfied merely by writing down 200 micrometers wet film. This comparison is arithmetic only. It does not demonstrate actual coverage, uniformity, cure, adhesion or measured acceptance on an enclosure.
Which mismatches require a review before issue?
Flag a schedule that omits wet or dry, uses inconsistent units, combines separate coats without a basis or lacks the actual product-data revision. Route application and inspection questions to the responsible coating reviewer. Do not invent a thickness tolerance or adjust readings to the desired result.
Engineering sign-off is performed only by the registered engineer on the job. The drawing team records approved requirements and evidence; it does not certify coating performance or prescribe product handling.
Common questions
What else should the bid team know?
Does a wet-film reading prove the dry-film thickness?
No. It can support a stated prediction, while actual acceptance uses the approved inspection basis.
Can solids by mass replace volume solids in this formula?
No. The calculator relationship uses volume solids.
Is 120 micrometers a recommended enclosure coating thickness?
No. It is the result of the synthetic example, not a product or project requirement.