I probably started using this product mid 80's and ever since then I've had it around . Used cases of it building Alaska commercial fishing boats and also on my own vessels of the 36'-40' variety fishing Ak . mostly fiberglass and aluminum , works well on either . Would always bed fuel tanks in 6-8 places with 5200 and then strap them down , 150 -300 gallons in the stern and take a beating .