The assembled fiberglass roving for spray-up is coated with based sizing, compatible with unsaturated polyester and vinyl ester resins. Potom je odrezaný vrtuľníkom, postriekaný živicou na forme a valcovaný, čo je potrebné na nasiaknutie živice do vlákien a eliminovať vzduchové bubliny. In the end, the glass-resin mixture is cured into the product.