The choice of modeling glue should always be based on the properties of the material and the nature of the joint, not on the universality of the product. Different glues operate on different chemical principles, so their effectiveness is closely linked to the type of material and the loads to which the joint will be subjected.
When and what glue to use
For plastic (polystyrene) used in injection molding, the best choice is plastic adhesive , which chemically bonds the component surfaces. This ensures a very durable bond and allows for further mechanical processing, such as sanding or re-engraving the parting lines.
Resin requires the use of cyanoacrylate or epoxy glue because it doesn't react with plastic adhesives. CA works well for small parts and accessories, while epoxy is the right choice for larger, heavier parts and conversions.
Metal and photoetched parts are best joined using CA glue of appropriate density. For structures subject to stress or load, epoxy glue is recommended, which provides greater mechanical resistance.
Transparent elements , such as fairings and windows, should be glued using PVA glue , which does not cause fogging and becomes colorless after drying.
Wood , found mainly in ship models and frame structures, responds best to carpentry glues , providing a flexible joint adapted to the work of the natural material
When not to use a given glue
Plastic glue should not be used on resin, metal, or photoetch, as it does not bond to these materials and is ineffective.
Cyanoacrylate glue is not recommended for bonding transparent elements due to the risk of whitening and permanent surface damage. It is also not the best choice for long, load-bearing plastic joints, where plastic glue provides better results.
Epoxy adhesives are not used where a very thin, capillary bond or rapid setting is required. Their use on fine details often leads to excess adhesive and a loss of precision.
PVA glues should not be used for structural and loaded elements, as the connection does not provide sufficient mechanical strength.
The most common mistakes when gluing models
One of the most serious mistakes is using too much glue . Excess plastic glue can lead to deformation of parts, while too much CA glue causes hard, difficult-to-process flash and a white film.
Another common problem is selecting the wrong adhesive for the material , such as trying to glue resin with plastic glue or using CA on transparent parts. Such errors result in a poor bond or permanent damage to the part.
Modelers often skip the surface preparation step . Resin and metal parts should be degreased, and plastics should be thoroughly cleaned of dust after sanding. Failure to do so significantly reduces the effectiveness of even the best modeling glue .
Another mistake is not performing a "dry fit" before gluing. Gluing components together without first checking their alignment leads to stress in the structure, gaps, and the need for subsequent use of putty.
Separating situations when a given adhesive is the right choice from those when it should be avoided helps avoid common workshop mistakes. This approach simplifies the decision-making process and facilitates informed model building, regardless of skill level.
FAQ – modeling glues
Which modeling glue is best for beginners?
The base should be a plastic glue designed for injection molding models and one medium-density CA glue for additions and repairs.
Is one glue enough for the entire model?
In practice, no. Complex model construction requires the use of various adhesives, tailored to the materials and nature of the connections.
Is CA glue suitable for plastic?
It can be used as an auxiliary, but plastic glue provides a much better quality and durability of the connection.
What to use to glue photo etch?
Most often, CA glue is used, and in the case of larger elements or loads – epoxy glue .
How to avoid white residue from CA glue?
Use a minimal amount of glue, ensure good ventilation, and avoid enclosed spaces. For transparent elements, use PVA glue .
Is epoxy glue difficult to use?
It requires greater precision and time, but offers the highest strength connections, especially for large and heavy components.
