I've got a job that has Sikkens on redwood. Problem is that the owners son did some unsupervised power washing and ended up doing some gouging of the siding. The groove isn't that deep, but needs to be sanded. I've never worked with Sikkens, so my question is, can I just sand and refinish a section? They called me in to potentially strip to the bare redwood, but I'm not sure what product to use. So is HD 80 what I want to tackle this job?