Tony
Last year I came across a product that impressed me so much that I bought a case of it, (with a friend) so I will always have good results in redoing my fibreglass. It is by Collinite, and called Cleaner and Boat wax. #920 and 925. My 1980 fg has given me pause for many yrs, as to getting it to look shiny, instead of like the surface on the concrete docks. I have also used it to shine up my 98 Motorhome FG, and it has outperformed the Collinite RV cleaner/wax that came to me with the MH.
The cleaner took away all the oxidation built up over the years, ie, cleaned right down to the shine! So much easier than compounding. Then a couple of coats of wax and the shine and good look lasts. So far, in the MH, where we are at the moment, in Palm Springs CA, the shine I put on in October looks as good as the neighbours who did theirs yesterday.
As to which to do first, I would do the FG, as the rubbing you will give it would mar the fresh Epifanes you will put on the teak, whereas the varnishing will not touch the FG surfaces, as you will be careful with your brushing technique and will mask if you need to be sure. The heat gun won't affect the FG. Unless the teak is already done in Cetol, which must be removed, there should be no need to remove the varnish before redoing it. You will need to put a few more coats where there are holes in the varnish, but you can use the existing finish as a base for your new finish without worrying about its durability or appearance, so long as you sand it all with 120 and get good adhesion.
Pictures would be nice.
-- Edited by koliver on Monday 6th of February 2012 09:23:50 AM