Both 365nm and 395nm UV lamps are used for UV curing processes, but there are some differences between them:

Wavelength: The primary difference between 365nm and 395nm UV lamps is their wavelength. 365nm lamps emit UV light at a wavelength of 365 nanometers, while 395nm lamps emit UV light at a wavelength of 395 nanometers.
Application: 365nm UV lamps are commonly used in applications where a very fast curing time is required, such as in the curing of inks and coatings on printed circuit boards, electronic components, and medical devices. 395nm UV lamps are typically used for applications that require a longer curing time, such as in the curing of adhesives, coatings, and sealants on various substrates.
Sensitivity: The sensitivity of the curing material to the UV wavelength also plays a role in determining which type of UV lamp to use. Some materials are more sensitive to 365nm light, while others are more sensitive to 395nm light.
Equipment: The type of equipment used in the UV curing process may also influence the choice of UV lamp. Some equipment may be designed specifically for use with a certain wavelength of UV light, while others may be more flexible in terms of the UV lamp used.
In summary, the choice between a 365nm and 395nm UV lamp for a specific application will depend on factors such as the required curing time, the sensitivity of the material being cured, and the type of equipment being used.

Uneven Application: If you are applying the UV coating too thickly in certain areas, it can result in an uneven distribution of the coating. This can lead to differences in curing times and cause wrinkles to form.

To avoid wrinkles when applying a thick layer of UV coating, it is important to ensure that the coating is applied evenly and with the proper thickness. 

UV Putty has its limitation for layer building. 

UV light can not get very deep inside of it because it contains solid powder. 

You can do all size you need only beware the thickness for each layer not more than 3mm.per layer.

So you can make very thick by putting many layers and flash the uv in between layer.

Most uv curable primer products in the market are designed this way. 

It needs to let the uv light get deep to the ground for the proper cured.

Yes, it has very high build and strong film. 

It has 98-100% solid content which 2K HS products normally have 50+%.

This means uv primer wet and dry film have same thickness because there is no solvent to escape and will not shrink.