I had some hairline cracks around the stanchions which are usually caused by everyone grabbing the lifelines when they are trying to help. and i had some around the deck as well.if the hairline cracks are where you have balsa core you have to determine if the crack goes thru to the balsa. it is well worth it, in my estimation and painful experience that you dig a bit if you think the crack does go all the way to the balsa to ascertain that the balsa is dry, bone dry

I talked to the interlux guy just before opening up the cracks and he gave me the best advice; thin out the paint and keep applying it to the cracks until the cracks were filled. it was the best and easiest approach.

i have now painted my deck twice and have decided the next time i'm going to try one of the materials that you cut and apply with adhesive.
dan
fidget's retreat
boston, ma