I have a log cabin which has t n q flooring which I have varnished in clear. I am in process of fitting skirting board which I plan to varnish in clear. I need to find a caulk to fill in the gaps. I need a caulk what best matches natural wood and can varnish but I cannot find one. Does anyone know where I can get one all I can find is silicone's but you cannot varnish this ?