Homeowner Guide
Who should not get a patio or pool deck coating in Metro Detroit?
You should not coat a Metro Detroit patio or pool deck if you want leftover garage epoxy, if the slab heaves or ponds, or if you plan to DIY epoxy in January, because freeze-thaw, driveway salt, and sun will peel the wrong chemistry, and the next step is drainage or slab work—not a yellow film that splits at every joint.
These are nos. Each section is a situation, why it fails in Michigan, and what to do instead.
If you need UV-stable chemistry, open joints, and a dry, stable slab, read the cost guide and quote that job—not a garage leftover.
Should I use leftover garage epoxy on the patio?
No. Aromatic epoxy ambers and chalks in UV. Outdoor work needs an aliphatic / polyaspartic build.
Situation: you have kit left from the bay and the patio is next. Why it fails in Michigan: summer sun yellows it, then freeze-thaw splits the brittle film.
What to do instead: spec a UV-stable outdoor system, or leave the broom finish. Garage flake pricing at $5–$9 / sq ft is not permission to put that chemistry outside.
Should I coat a patio that still ponds after rain?
No. A film is not a slope correction. Standing water plus freeze-thaw blows a coating apart.
Situation: puddles at the door or around the pool drain. Why it fails in Michigan: ice in the pond, then lift. Moisture at or above 4.0 lbs MVER is a separate stop if you also skipped a barrier.
What to do instead: a concrete trade for slope and drainage. Coat only after water leaves the slab on purpose.
Should I coat a pool deck that heaves or is salt-rotten at the driveway?
No. A coating cannot stitch moving or chloride-rotten concrete.
Situation: a step at the joint, spall where the plow throws salt, hollow sounding edges. Why it fails in Michigan: freeze-thaw and road salt keep working the paste.
What to do instead: patch or replace the concrete. A decorative film on rotten paste is a spring peel.
Should I DIY epoxy on the patio in January?
No. Conventional epoxy wants 50°F–90°F. A frozen Michigan slab is outside that window.
Situation: unseasonably “nice” January afternoon. Why it fails in Michigan: the slab is still cold, cure stretches, then March freeze-thaw finishes a weak film.
What to do instead: wait. Polyaspartic is published at about 35°F–100°F+ with the right kit, and that is still a grind-first contractor install, not a kit on frozen broom.
Should I coat over old patio paint or a peeling kit?
No. Unknown films are 100% removal. There is no outdoor skim-and-recoat.
Situation: gray deck paint that “mostly stuck.” Why it fails in Michigan: UV and chloride find the intercoat.
What to do instead: strip. Calculator removal adders are $1–$2 / sq ft extra, then a UV-stable rebuild. A patio-specific packaged price is [VERIFY].
Should I coat a patio that was poured last month?
No. New concrete is typically 28 days or more, then a moisture test.
Situation: new pool deck, party in three weeks. Why it fails in Michigan: outgassing plus sun, then the first freeze.
What to do instead: wait 28 days, test MVER, grind. If the reading is at or above 4.0 lbs, barrier first—or skip the film.
What do people ask when they should not coat the patio?
No. Spec the outdoor chemistry from the start. Aromatic epoxy that already went down outside is a candidate for strip, not a promise of a later topcoat.
Ponding is a no. Texture helps wet feet on a correctly sloped slab. It does not move a puddle. Fix drainage first.
Unknown epoxy is 100% removal. UV and salt peel a skim coat with the old film. Removal adders are $1–$2 / sq ft extra.
For conventional epoxy, yes if the slab is outside 50°F–90°F. Polyaspartic is published at about 35°F–100°F+. A frozen broom finish is still a wait.
Typically under 28 days. Then test MVER. Sun does not make a green slab ready.
Fix slope, replace rotten concrete, wait on a new pour, or strip the old film. A coating quote belongs after the slab is a candidate for UV-stable chemistry.