I HAVE A BOAT PARTLY FINISHED THAT STILL NEEDED 2-3 MORE COATS OF EPOXY TO FILL IN THE WEAVE IN THE FIBREGLASS CLOTH WHEN I WAS UNABLE TO WORK ON IT FOR A FEW WEEKS. SINCE I CAN'T SAND IT DOWN VERY WELL WITHOUT SANDING THE CLOTH AND WEAKENING IT AND SYSTEMS 3 SAY SUBSEQUENT COATS OF EPOXY WON'T ADHERE UNLESS THERE IS A MECHANICAL BOND CREATED, I AM AT A BIT OF A LOSS AS TO HOW TO PROCEED. ANY ADVICE WOULD BE APPRECIATED. TOM