ʻO ke kaʻina hana kau lima ka mea kahiko loa o ka hana ʻana i nā huahana FRP GRP. ʻAʻole ia e koi i nā mākau loea a me nā mīkini. He ala ia o ka leo liʻiliʻi a me ka ikaika hana kiʻekiʻe, kūpono loa no nā ʻāpana nui e like me ka moku FRP. Hoʻohana mau ʻia ka hapalua o ka mold i ka wā o ka hoʻopaʻa lima.
Loaʻa i ka mold ke ʻano o nā huahana FRP. I mea e ʻālohilohi ai ka ʻili o ka huahana, pono e loaʻa i ka ʻili o ka poni ke ʻano like. Inā maʻemaʻe ka ʻili o waho o ka huahana, hana ʻia ka huahana i loko o ka mole wahine. Pela no hoi, ina he laumania ko loko, a laila, hana ia ka humuhumu kane. Pono ʻole ka ʻōpala i nā hemahema no ka mea e hoʻokumu ka huahana FRP i ka hōʻailona o ka hemahema.