That defect is called " boiled reducer" and popping. The main reasons of that defect can be next: 1 The flash off time before infrared drying was too short. In order to avoid that problem, we recommend you keep to recommended intermediate flash-off times. Usually it takes approximately 15-20 minutes before curing.
2 The panel temperature becomes too high when the distance between Infrared lamp and painted object is too small. Keep to recommended distances and intensities when drying with infrared lamp. For example for HT-2000, we recommend a distance no less than 50cm from metal and 60cm for plastic.
3 Flash-off time between spray coats too short for wet-on-wet process. Keep to recommended film builds and flash-off times between coats. You should to learn the Technical Data Sheeting of material more carefully before the beginning the work.
4 Hardener or reducer too fast. Use hardener and reducer suitable for the ambient temperature. Normally manufacturer gives all characteristics of product for applying at 20 degree.
Such a defect will be eliminated only by repainting the element. You should sand the paint system down. If reducer boils are not completely removed by sanding, pinholes will appear once the next coats have been applied. Refinish using the recommended topcoats.
Infrared radiation is called electromagnetic radiation. It occupies the spectral range between the red border of visible radiation and short wave radio emission.
The area of infrared radiation is divided into three different ranges:
Shortwave (beam length from 0.74 to 2.5 microns)
Medium wave (from 2.5 to 50 microns)
Longwave (from 50 to 2000 microns)
The highest heat transfer rate in shortwave infrared curing lamps. That is why this auto refinish infrared curing method is most common and effective.
It is very important that the thermoradiation method (using an IR lamp for drying) allows drying at the highest speed.
Elapsed time can be as little as 3 to 25 minutes.
For comparison, it is 2 times faster than with the convection method.
The professional device for paint stations, car services and body shops.
It allows you to dry clear coat, paints, body fillers and other materials due to infrared radiation is one of the fastest, most efficient and convenient ways. It is stable and mobile when working.
Incandescent bulbs are attached to a rotating console, providing a lifting height of 2 meters.
At the same time, the suspension system is fully balanced, which makes the user's work more comfortable.
You sometimes hear people in the automotive refinish industry saying “short-wave heats from the inside out” when drying/curing paint.
The depth of penetration of a short wave depends on several factors: the structure of the material, the moisture content of the material, density, etc.
Theoretically, the penetration depth can reach 12 mm, in practice it is a figure from 2 to 7 mm.
The paint itself is made of molecules, so infrared can not magically pass through it without absorption; the first thing that will heat up is the paint itself.
Short-wave infrared energy penetrates deeper into an object, so in the case of paint curing, both the molecules in the paint and molecules in the substrate (normally mild steel) generate heat.
Wet paint heat buildup is different than dry paint, as the temperature is held back as liquids evaporate.
One of the repair processes that can be improved with shortwave Infrared paint curing lamp is curing body filler.
Traditionally, preparers have to wait 15 to 20 minutes for body filler to dry before they can start sanding it.
With electric Infrared paint curing systems, curing time is reduced to only a minute or two.
While this may not seem like much time, the savings add up when you are filling multiple items each day,
or working on complicated repairs that require multiple filler applications.