Miriam C. wrote:You might tell the sales person that Shellac is said by the makers that it drys hard and may crack. Spar Varnish is also UV protective. Give it a few coats. You should also make sure you get the ends really good.
Stain is your choice. I had trouble with Minwax not letting the varnish stick really well. Might just be my experience.....
i'd have to know the stain and top coat you used to know for sure but here's a few maybes
1- heavily pigmented stains applied and then not wiped off properly can leave your wood coated with pigments on the surface. like a fine coating of dust, this will interfere with good adhesion. make sure you wipe the panel down really well. sometimes people try to stain too big of an area at once and the stain dries too much before wiping it off.. if this happens, just get a rag damp with stain and re-wipe. the fresh stain will reactive the old stuff and allow you to properly wipe the residue off.. better still, get some solvent that is the same as in the stain and use that on the rag.
2- you used an oil based stain and did not let it dry long enough before coating it with your top coat. on the can it says 4 hours?? well that for hours is at 75 degrees. this may end up to be 2 days in a dark 50 degree garage. although it is not always the case, it is often enough to consider it a rule.. you can not put a product on an uncured, undried product.
3- moisture content in wood. most products for wood are supposed to be applied to wood with between 7 and 14% moisture content. anything higher than that can be bad news.. once it makes it to the garage it isn't long before wood can pick up a lot of moisture and still feel dry. you need to get to about 20% before it starts to feel damp. make sure your wood is good and dry.