And yes, an Experimental aircraft needs an Annual Condition Inspection
which can be accomplished by any A&P mechanic, though you might like to
have one who is familiar with gliders and/or composite construction.Â* If
you built it yourself, and secured a Repairman Certificate from the FAA,
you can perform your own inspections and repairs on that aircraft only.

An Annual Inspection for a Standard Airworthiness aircraft must be
inspected by an A&P mechanic with Inspection Authorization.

JJDK737 is right on about the coin test.

On 3/28/2020 7:24 AM, wrote:
A coin tap test is simply that.

Tap the composite material with a coin. If the noise you here is sharp and solid, so is the material.
If the sound is dull and hollow, the material is compromised in some way.

--
Dan, 5J