1) Choose a suitable type of gel coat before use.
2) The FRP mold should be thoroughly prepared and the surface of the mold should be treated well before use.
3) Fully stir the gel coat in the original barrel before use, but the speed should be appropriate to avoid mixing air bubbles.
4) Before starting construction, it is recommended that the working temperature of the gel coat and mold be 15°C-30°C, and the ideal mold temperature should be 2°C-3°C higher than the gel coat temperature. This results in a glossier, fuller gel coat surface after curing.
5) The relative temperature in the workshop should be lower than 80%. If the humidity is high, the curing temperature should be increased. Also prevent water from accumulating on the mold surface.
6) The surface of the mold should be carefully polished and fully waxed, and the new mold should be pretreated. Do not use silicone-based mold release waxes. Water-soluble mold release agents must wait for the water to evaporate before applying the gel coat.
7) When using the gel coat of FRP products, do not dilute with solvent, such as acetone, banana water, etc. If a lower viscosity is required during use, a small amount of styrene (≤2%) can be added.
8) The curing agent used in the gel coat is methyl ethyl ketone peroxide, and the dosage is generally 1-2%. If the amount of the curing agent is too high or too low, it will affect its curing degree, which will reduce the water resistance and weather resistance of the gel coat. .
9) If you add color paste yourself, you must ensure the uniformity and stability of the color. Accurately weigh and mix using low shear equipment in the recommended amount.
10) When spraying, in order to achieve an appropriate thickness, it should be sprayed 2-3 times, so as to obtain a good defoaming effect.
11) When spraying the gel coat, it is necessary to select the appropriate nozzle, spray pressure and spray distance (50-80cm) and vertical direction. The spray gun should move at a constant speed. The nozzle should be moved to the outside of the mold first, and then stop from the edge of the mold to the outside. , Colleagues should ensure that the air source is dry and clean.
12) In order to obtain a smooth gel coat layer, the spray thickness is 0.4-0.6 mm (equivalent to 500-700 grams of gel coat per square meter), the thickness is too thin, resulting in under-curing; too thick, easy to sag, crack and pinhole . Thickness can be measured using a thickness gauge.
13) For difficult parts of the mold, such as deep grooves, when the spray gun cannot maintain a reasonable position, it must be brushed with a brush. The gel time in this area is longer and a little ventilation can be used.
14) Make sure that the mold has good ventilation, because the styrene monomer will inhibit the polymerization, which is due to the large molecular weight of styrene, which will sink in the recesses of the mold.
15) Once the gel coat of the glass fiber reinforced plastic product is fully cured (the gel coat layer only sticks to the hand without sticking to the hand with a finger), proceed to the next step.