Starter relay or no starter relay, Been reading up for an hour and still don't know!! Options

[David Stowers]

On two occasions recently on pulling onto my driveway after a long journey my car won't restart after turning off to unlock the garage door. Luckily I can then just push the car in but with a European tour booked in the summer I'd like to sort the problem.
When I get back in after opening the garage the lights on the dash dim when I turn the key to start but there is no click. 20 minutes later it will start right up. Is this the problem that will be solved by a hot start relay kit or just a good old fashioned sticky solenoid? I'd rather do just the relay or just replace the solenoid so which is it?
Thanks guys

[toolguy]

In your first post, you said the lights go dim when trying to crank a hot engine. . this indicates an excessive current draw, which 'should' mean the solenoid is operating and trying to pass current to the starter itself. . It could mean the contacts inside the solenoid have high resistance [lots of pitting] and it becomes 'terminal' when the starter and solenoid get hot. .
IMHO, if this is the case, adding a remote relay is not the correct fix. . all the relay does is place less of a load on the ignition switch itself. The relay is in turn passing the same yellow wire current to the solenoid. .
You can take the solenoid apart and clean up the contacts inside. .

[David Stowers]

You can take the solenoid apart and clean up the contacts inside. .

Right, that's my first move as its free!
Then maybe a relay to preserve my switch.