Hi all. Can I render over render?

Had render done on an extension about 6 months back. Render is sound but finish not acceptable as a massive cold snap hit and the lads left ripples in top coat.
Can this be rendered over and if so best methods please? I've been told Tyrolean may work well but would prefer a smoother finish if possible.
Ps I realise getting the job done in the winter wasn't smart!
Help much appreciated