What is the best way to fix uneven varnish on a painting that is causing non-uniform glare?

Medium: Oil (Dark Colors)
Varnish: Damar - High Gloss

Problem: Initial layer brushed on too thick and at an angle, some varnish 'ran'

I want to be able to even out the glare and maybe go to a flat varnish since the picture is a portrait and there is a lot of dark areas, some appear flat, some appear shiny.

Can the varnish be sanded down evenly with a light sand paper and then re-varnished with a matte spray?

Help please

Dear Art Rookie,

There is no easy answer to your very good questions, but if you will please post this again at www.amien.org, we can help.

AMIEN is the Art Materials Information and Eduction Network, a not-for-profit, unbiased educational program. Post there is easy and free: register, and then post your question.

We will watch this space for other answers to the questions.

I will, thank you so much!