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Primers are also used to hide joints and seams to give a finished look. Other primers require that the topcoat be applied within a certain amount of time after the primer dries to ensure optimal adhesion. This varies from 24 hours to up to two weeks after the primer has dried. Painting after the suggested time-frame may cause performance issues ...
Today, epoxy and the acrylic types predominate. The description and the generally touted advantages are as follows: Epoxy: Although aliphatic epoxy materials have been used, the majority of EPD epoxy types are based on aromatic epoxy polymers, most commonly based on polymerization of diglycidal ethers of bis phenol A. The polymer backbone may ...
The Canadian Conservation Institute lists ten agents of deterioration that play a role in damaging an object or work of art. [4] While all of these agents play a role in damaging a painting over its lifetime, five primary agents are involved in the degradation of an artwork's canvas and its pigment layers.
High Humidity reduces mechanical damage such as brittle paint but raises the risks of biological organisms, e.g. white efflorescence and green-to-black stains on a panel painting. [12] High Humidity also raises the risks of curving or warping of the wood over time, forcing the paint to flake off.
The frames around paintings are not just for aesthetic appearances. Frames are also used to protect the more sensitive parts of a painting when handled by hand, and they reduce the potential for damage if the painting is dropped. [3] There are also specialists that work on the conservation and restoration of painting frames.
In the medium of watercolors, wet-on-wet painting requires a certain finesse in embracing unpredictability. Highly translucent and prone to accidents, watercolor paint will bloom in unpredictable ways that, depending on the artist's frame of mind, can be a boon or a burden. [3]
Overpainting is the final layers of paint, over some type of underpainting, in a system of working in layers. It can also refer to later paint added by restorers, or an artist or dealer wishing to "improve" or update an old image—a very common practice in the past. The underpainting gives a context in which the paint-strokes of the ...
The second most important part of FBE coatings is the curing agent or hardener. Curing agents react either with the epoxy ring or with the hydroxyl groups, along the epoxy molecular chain. Various types of curing agents, used in FBE manufacture, include dicyandiamide, aromatic amines, aliphatic diamines and organic acid anhydrides. [6]
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