Just as Davie did, Billy also promises to help fix up the yacht. However, unlike Davie, he does it. This highlights the fact that Davie doesn’t really bother.
“Ah could paint it if ye like”
When Davie loses his job, Billy offers to try and get him a job where he works. This is a contrast to Davies personality; Billy is considerate and thinks of others whereas Davie only thinks of himself.
“Ah might be able tae get ye a start in our place.”
When Ian says this, it shows that they have a strong relationship - it is strong enough that they could work together.
“That’s what ma da says. He’s gonnae get mi in wi him at the paintin”