TOPCOATS / ZERO RUST
Normally, commercial topcoats may be applied in 24 hours or after solvents
have evaporated. Experience has shown Zero Rust to be compatible with a wide
variety of commercial topcoats. As it is impossible to cover all topcoat possibilities
here, it is highly recommended that test panels be done by the applicator to
determine not only compatibility, but also the dry time window for your selected
Two-component automotive urethanes that are acetone-free and contain
high solids can be used successfully. Urethanes that contain acetones, however,
make topcoating air dry finishes more difficult. Acetone is now VOC exempt
and is increasingly being used in urethanes. Because acetone is an aggressive
paint stripper, it can soften and wrinkle or lift the undercoat, thus shortening
the lift-free window. More precise timing is required when topcoating with
low viscosity urethanes that contain acetone or that are thinned with acetone.
A 4 mil wet film of Zero Rust can be topcoated within three to six hours
with minimal solvent trap problems. If you cannot apply the topcoat within
this time frame, it is advisable to wait 24 hours before top coating. Additionally,
applying a light bridge coat of the urethane before the flood coat will
help stop solvent dive-in, which can aggravate lifting.
Of course, Zero Rust
can be utilized alone without a topcoat. When gloss and UV protection are
desired, topcoat Zero Rust with Crystal Coat.