In Farage's case, many of his policies are just the racial / misogynist / homophobic insults you see scribbled on lavatory walls,
plus the economic policies from the hard right of the Tory party, which lose the Tories votes whenever they come out of the closet
Faragists agree on wanting a No Deal Brexit, but many of them won't like anything else Farage wants - which will come after Brexit
He has to keep his policies quiet for as long as possible
It helps that his new party has no members to question him, or form their own policies