I can't help with the specifics, but the press studs are generally screwed in the structural ridges in the underside of the hard lid. The potential problem with that is the structural ridges are formed under the fibreglass with very cheap, very weak timber such as packing ply; and the depth of the resin can vary greatly.
That ply substrates only function is to provide form/or shape, for the fibre glass laid over the top. Fibreglass is very strong, but brittle and screws don't cut a thread very well through it. The ply substrate also is neither designed or capable of holding a screw thread very well. All in all the screw attachment method alone is not ideal. You'll often see the mesh and press studs detached on display vans, such as at caravan shows etc.
Put a dob of adhesive under the press stud before you screw it on with a quality adhesive such as Sika 291 polyurethane sealant (stocked at Bunnings). Lightly scuff the fibreglass with a wet/dry, then clean the surface first with a prep wash or turps or metho or similar and the press studs should stay attached indefinitely
That ply substrates only function is to provide form/or shape, for the fibre glass laid over the top. Fibreglass is very strong, but brittle and screws don't cut a thread very well through it. The ply substrate also is neither designed or capable of holding a screw thread very well. All in all the screw attachment method alone is not ideal. You'll often see the mesh and press studs detached on display vans, such as at caravan shows etc.
Put a dob of adhesive under the press stud before you screw it on with a quality adhesive such as Sika 291 polyurethane sealant (stocked at Bunnings). Lightly scuff the fibreglass with a wet/dry, then clean the surface first with a prep wash or turps or metho or similar and the press studs should stay attached indefinitely
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