Sonshine Products uses a specially-developed polyethylene plastic to seal the foam cores of its ThermoShield premium spa covers. VaporShieldPE is designed for excellent resistance to vapor penetration, while also degrading gracefully avoiding the dreaded shatter effect that is found in most companies plastic.
VaporShieldPE would be useless if it were not paired with an outstanding sealing system to lock out the water from the foam core. Our vacuum-forming, pneumatic impulse-sealing equipment produces a heat-sealed foam core that is superior to not only taped plastic seals, but also to what most other cover manufacturers use: Hand-held nicron-wire sealing systems. Because our sealer is 9' long, we are not splicing welds in order to try to seal the typical lengths of spa cover foam cores. Our integrated vacuum system allows an all-around seal with the need to tape off holes where the vacuum hose was installed. Also, the 1/4" seal from our sealing equipment is far superior to wire-thin seals that the hand-held models typically produce. Yes, our sealing system was 30x more expensive to purchase than the hand-held models, but the results speak for themselves.