Wrinkling, Alligatoring or Blistering
The Problem:
Topcoat is not smooth when dry.
The Cause:
This can be the result of the bottom coat(s) not being dry enough
to accept an additional coat. Or, a top coats solvents etches
(eats) into weaker or uncured bottom coats. The job site conditions
and too heavy a first coat are the usual reason for these problems.
Blistering:
Will sometimes occur in spots and could be caused by
spotty drying of bottom coats.
Wrinkling:
Will result as blisters over a large area of the floor.
Alligatoring:
Very heavy wrinkling results when the topcoat etches (eats)
into the bottom coat and actually lifts it from raw the wood
or the stain or sealer.
How to fix the problem:
Blistering and wrinkling can usually be screened and coated
with a very thin coat of finish. Alligatoring requires a complete
sand and re-coat.
How to avoid in the future:
Determining the conditions at the job site and ensuring it is
practical to apply stains and finishes is the fist duty of professional
sand and finishers. Tools such as hygrometers and moisture meters
tell you what the job site conditions are so you can act accordingly.
Should the conditions be borderline it is wise to allow more
time than normal to ensure the sealer, stain or finish is dry.
Correct temperature, humidity and ventilation are the keys to
avoiding these problems. In addition, not following the coverage
rate directions such as, applying too heavy a coat, often lead
to this condition.
