Hand lay up forming is a form of laying down reinforcements such as fiberglass layer by layer, while impregnating each layer with adhesive and rolling the laminate with special rollers (outgassing).

The simplest hardware and technical design. It is used in the manufacture of large-scale products: building structures, hulls, car bodies. An example of the largest product obtained by hand laying is the body of a minesweeper 50 meters long and 8 meters wide. Using this method, the possibility of adjusting the filler content can be excluded. Other disadvantages include.

High labor cost.

High material cost.

The product manufacturing cycle is long.

The advantage of this method is its universality, i.e. obtaining products of almost any shape and size.

Since rolling the product with corrugated rollers to remove air and compact the material is carried out under low force (less than 1.5 MPa), the load on the mold is also small, so, in most cases, glass fiber reinforcement uses plastic Mold, about 10 times cheaper than a proper heat press mold.

The low cost of fiberglass molds is a major prerequisite for using manual layout methods in small-scale production, especially since the low wear resistance of these molds limits their useful life to only a few hundred parts. In the field of product production, mainly small enterprises. Despite these shortcomings, manual calculation methods are quite common.

Spraying of adhesive (resin)

The basic principle of the method is that the adhesive is supplied to the mold surface by means of air flow or pressure through a special spraying device, and then the laminate is rolled by hand with special rollers (degassing). The process requires special equipment, which ultimately improves labor productivity in the manual molding process, significantly saves material consumption, and especially eliminates the influence of human factors on the adhesive preparation process.

In the process of spraying and producing FRP products, there are two main directions:

-Gel coat spraying.

-Resin spraying (resin + glass roving).

Gel coat spray

Air spray guns are spray guns with a nozzle of 4.0 – 4.5 mm, depending on the viscosity of the gel coat. We offers equipment  – spray guns for spraying gel coats and resins series G. When using these sprayers, the adhesive needs to be prepared – mixing the resin and hardener by hand.

Airless Spray – External and internal mixing units for hardeners and gel coats. These units are a material pump system (gel coat, hardener) that doses and applies material proportionally to the mold. Introducing MVP, which offers a full range of gel coat spray equipment, featuring three types of pumping systems.

Resin spraying

Air sprayer – In fact, this device is hardly ever used.

Airless Spray – The principle of operation of the unit is similar to that for applying gel coats. The main difference between these units is the lower power factor of the material pump. This is because resins are 2.0 – 2.5 times less viscous than gel coats. In addition, the unit provides for the cutting of glass rovings, which are applied to the mold (above) together with the resin flow. After the adhesive is sprayed, the laminate needs to be rolled (outgassed) with special rollers, similar to the hand forming process.