Adam : This is perhaps my weakest area, But yes you can burn the extra straw off any time! However
all of your coats
should end ruff until you get to the final waterproofing coat ! The ruff-ness, and if necessary
a spray
water bottle to wet the surface of the last coat before your finish Coat assures good contact and a
dhesion between each coat !
Hopefully someone else will feel more qualified to talk you through the steps in making and applying that last coat !
For the Good of the Craft ! Big AL