Frequently asked questions

senotherm® - Questions & Answers

What pre-treatment does the substrate require prior to coating?

The best results are achieved with a degreased, grit blasted surface, though a clean grease-free surface meets most requirements. However, grit blasting is absolutely essential for many grades of product (senotherm® UHT-HYDRO, senotherm® UHT Series 1157 and senotherm® UHT colours).

Detailed information can be found in the respective processing guidelines.

Do senotherm® coatings need to be thinned before application?

senotherm® coatings are ready to spray. No thinner is required.

How can senotherm® coatings be processed?

senotherm® products can be processed by conventional high pressure spray as well as HVLP systems. Electrostatic processing is also possible. We would advise against Airless and Airmix systems. Adjustments for submersible and spreadable coatings are also possible.

What film thicknesses are required?

Film thicknesses should be between 20μm und 30μm. With film thicknesses:

> 50μm there’s a danger of paint flaking off.

< 15μm there’s reduced corrosion protection.

Do senotherm® coatings need to be cured?

Most senotherm® coatings air dry. After drying, the coated parts are ready for the next processing stage or for transportation. 

However, systems from the senotherm® CLASSIC product range need approximately 250°C to harden completely. Usually, this takes place when the appliance is heated for the first time. In the case of senotherm® UHT und senotherm® UHT-HYDRO systems, drying and complete hardening take place at room temperature during the production process.

Detailed information can be found in the respective processing guidelines and information on senotherm® NON-SMOKER® Coatings.

Why does the stove smoke the first time it’s used?

Conventional coatings for stoves are usually only dried during the course of the production process. Final hardening of the coating takes place when the product is first used and results in the release of smoke and an odour. The troublesome smell can be avoided by using senotherm® NON-SMOKER® Coatings.

Are the fumes released by a stove harmful to health?

Smoke from conventional stove coatings produces a fine dust and volatile organic compounds (VOC). In order to avoid adverse effects to health, these should not be inhaled. We therefore recommend good ventilation of the room concerned and avoiding unnecessary exposure to the fumes.

Do waterbased coatings also smoke when heated?

Classic stove coatings can also be developed as waterbased coatings. When heated, they then react like solvent based systems. Due to the composition, the smoke and obnoxious odour released are usually worse than with comparable solvent based systems. For this reason our smoke free senotherm® UHT-HYDRO coatings for stoves are available only as waterbased.

How can damage be repaired?

Tried and tested repair systems, such as wet paints, spray cans and bottles with lid brushes are available in a matching colour for every senotherm® Series. More serious damage should be lightly sanded before being touched up. Following repair, the total film thickness of the coating should not exceed 50 µm.

Which colours are available?

A wide variety of colours and effects is available depending on the senotherm® Series. Classification, for example according to RAL or NCS, isn’t usually possible because of the structure and gloss.

Can grills or barbecues be coated with senotherm® coatings?

In principle, grills and barbecues can be coated with senotherm® coatings. However, as these coatings are not approved for direct food contact, grill plates and pans cannot be coated. For better corrosion protection from outdoor exposure, we recommend a 2 coat system with a temperature resistant senotherm® zinc dust primer.